Well, looks like my crazy idea of jumping the palace is now picking up speed after all... 
But at the moment we have different problems...
1. 1725BC
Move worker to forest N-NE of Leipzig. Pillage Dutch mine hill.
2. 1720BC
Finish Pottery, start Writing.
Berlin: archer -> settler. (This is not good, but I think with -4gpt unit upkeep it will be our ruin, if I continue building units.
Leipzig switches to granary.
3. 1675BC
Berlin grows. A Dutch warrior/archer pair appears S-SW of our mountain outlook. Move the two archers from Berlin to the mining worker on the wheat tile in order to great them next turn.
Pillage second wine hill.
4. 1650BC
Leipzig grows. Switch worked forest to wheat, so that we have 4 turn growth now!
Need to reduce science to 60%, as the treasury is nearly empty.
First archer attacks Dutch archer on grassland -- and dies!!
Second archer finishes the job. Move spear from Leipzig onto archer as cover against the warrior.
Good thing is: can raise science to 70% now and go at 0gpt.
IBT: An archer out of Amsterdam attacks our pillaging spear and perishes.
5. 1625BC
Regrouping around Leipzig.
Pillage last Dutch wine; they will go thirsty from now on...
IBT: Dutch call me and offer peace, if we give them Iron Working. No thanks...
6. 1600BC
Healed archer now kills the remaining warrior near Leipzig.
Mine on the wheat tile finishes and worker moves to forest W of Leipzig. The other worker meanwhile finished his forest and moves back 1N of Leipzig. (No time for roading.)
For the next few turns our "Dutch spear" moves out of Dutch territory, so it can heal.
7. 1575BC
Worker starts chopping, the other one moves onto the forest as well.
8. 1550BC
Berlin: settler -> archer.
Settler moves to NC2 location. (Moving to NC1 would take 3 turns and we are currently at -4gpt again. Another settler from Leipzig can later reach NC1 in one turn, so that'll be faster.)
Leipzig grows, granary now due in 4 turns, but with the last remaining chop it will finish in 2. (This took longer than expected.)
9. 1525BC
Found Hamburg, it starts on a barracks.
No more unit upkeep! Research can now be set to 90%, while making +1gpt.
10. 1500BC
Leipzig finishes the granary and starts a worker.
Now I realize our big big problem: thanks to not being on the river, there is no 4-turner in Leipzig!!! (Why, oh why didn't you build it on the river...)
Here is the reason: one shield is lost due to corruption. So at size 4 we make only 5 shields: city center (1), mined wheat (1), two mined BG (4), corruption (-1). This is one shield short for the cycle "4 -> 5 -> (6, fallback to 4)".
The cycle at one size larger ("5 -> 6 -> (7, fallback to 5)") would have enough shields, but we can't temporarily grow to size 7 (unless we build an aqueduct)!
Please double-check my calculation, but I don't see any solution to this problem (other than building an aqueduct).
Fortunately we can build 2-turn workers at size 4 as well as at size 5. And fortunately we could do the following: use Leipzig as "5-turner" (which will waste a lot of food) and as worker pump for the moment and work on setting up Hamburg as a 4-turner instead. This is possible, as Hamburg is on the river and has access to both wheats and one BG (after building NC5). Build will require a lot of mining and irrigating and another granary.
Handover notes:
I think we need a couple of workers now to get more of the river grasslands around Berlin and some of the plains for Hamburg improved. Also begin roading towards NC1 and NC5 (if we want Hamburg as a 4-turner).
Two archers are currently coming for our "Dutch spear". It is now completely healed again and can fortify on a mountain next turn to wait for the archers.
Writing is currently at 9 turns, but with Berlin growing back (and more roads being added) it can probably be done in 7.

But at the moment we have different problems...
Spoiler :
1. 1725BC
Move worker to forest N-NE of Leipzig. Pillage Dutch mine hill.
2. 1720BC
Finish Pottery, start Writing.
Berlin: archer -> settler. (This is not good, but I think with -4gpt unit upkeep it will be our ruin, if I continue building units.
Leipzig switches to granary.
3. 1675BC
Berlin grows. A Dutch warrior/archer pair appears S-SW of our mountain outlook. Move the two archers from Berlin to the mining worker on the wheat tile in order to great them next turn.
Pillage second wine hill.
4. 1650BC
Leipzig grows. Switch worked forest to wheat, so that we have 4 turn growth now!
Need to reduce science to 60%, as the treasury is nearly empty.
First archer attacks Dutch archer on grassland -- and dies!!

Good thing is: can raise science to 70% now and go at 0gpt.
IBT: An archer out of Amsterdam attacks our pillaging spear and perishes.

5. 1625BC
Regrouping around Leipzig.
Pillage last Dutch wine; they will go thirsty from now on...

IBT: Dutch call me and offer peace, if we give them Iron Working. No thanks...
6. 1600BC
Healed archer now kills the remaining warrior near Leipzig.
Mine on the wheat tile finishes and worker moves to forest W of Leipzig. The other worker meanwhile finished his forest and moves back 1N of Leipzig. (No time for roading.)
For the next few turns our "Dutch spear" moves out of Dutch territory, so it can heal.
7. 1575BC
Worker starts chopping, the other one moves onto the forest as well.
8. 1550BC
Berlin: settler -> archer.
Settler moves to NC2 location. (Moving to NC1 would take 3 turns and we are currently at -4gpt again. Another settler from Leipzig can later reach NC1 in one turn, so that'll be faster.)
Leipzig grows, granary now due in 4 turns, but with the last remaining chop it will finish in 2. (This took longer than expected.)
9. 1525BC
Found Hamburg, it starts on a barracks.
No more unit upkeep! Research can now be set to 90%, while making +1gpt.
10. 1500BC
Leipzig finishes the granary and starts a worker.
Now I realize our big big problem: thanks to not being on the river, there is no 4-turner in Leipzig!!! (Why, oh why didn't you build it on the river...)
Here is the reason: one shield is lost due to corruption. So at size 4 we make only 5 shields: city center (1), mined wheat (1), two mined BG (4), corruption (-1). This is one shield short for the cycle "4 -> 5 -> (6, fallback to 4)".
The cycle at one size larger ("5 -> 6 -> (7, fallback to 5)") would have enough shields, but we can't temporarily grow to size 7 (unless we build an aqueduct)!
Please double-check my calculation, but I don't see any solution to this problem (other than building an aqueduct).
Fortunately we can build 2-turn workers at size 4 as well as at size 5. And fortunately we could do the following: use Leipzig as "5-turner" (which will waste a lot of food) and as worker pump for the moment and work on setting up Hamburg as a 4-turner instead. This is possible, as Hamburg is on the river and has access to both wheats and one BG (after building NC5). Build will require a lot of mining and irrigating and another granary.
Handover notes:
I think we need a couple of workers now to get more of the river grasslands around Berlin and some of the plains for Hamburg improved. Also begin roading towards NC1 and NC5 (if we want Hamburg as a 4-turner).
Two archers are currently coming for our "Dutch spear". It is now completely healed again and can fortify on a mountain next turn to wait for the archers.
Writing is currently at 9 turns, but with Berlin growing back (and more roads being added) it can probably be done in 7.