Made a quick testgame, with little detail beyond the BFC and Zara's location.
I tested going BW-AH, and seeing how fast a settler could be built with two worker schemes: Farm-Mine-Farm, and Farm-Farm-Mine.
Basic build: finish worker, build warriors, switch to settler at size 3. Always work best tiles (use the river

bonus, and silver mine when completed).
Farm-Mine-Farm results:
Settler completed on T48, 9

overflow, 3

stored
One Warrior built, 11

into next, no decay.
BW in, AH in, 39

into next tech.
Farm x2, Mine x1, 1 chop, 1 turn into another.
Farm-Farm-Mine results (at turn 48):
Settler completed on T46. 22

accumulated at T28.
Two warriors built. No overflow.
BW in, AH at 214/234

Farm x2, Mine x1, 1 chop.
Comparison:
The FMF approach gains one workerturn, 59

.
The FFM approach gains two turns earlier settler, one turn earlier 2nd warrior, 2

, 19

.
Direct Writing path:
Will lose 5-6 worker turns+however many it takes for the 2nd city to be founded (assuming we found by cows, either one).
If we tech Wheel first, we cannot possibly connect anything of value before the worker is needed elsewhere, but we can build some of the road, and likely save 1-2 turns moving the settler.
Discussion:
I think we should stick to BW-AH, but if end up not settling by cows, then AH could be delayed in favor of wheel-pottery. Copper location may also change things.
I am a bit unsure of the best worker actions. If we can block Zara's westward expansion with one city by the cows+oasis, then we are not pressed for expansion, and can benefit from the tech boost. But otherwise, it is probably best to go for the max REX approach.
Testgame at T14 attached, someone feel free to grab it and run tests, and maybe edit the surrounding landscape to match (and please do so if you have the time, the map editor hurts my head

, and I want to play all the XOTMs too). We can probably benefit from more tests later, where we will want more detail.
If noone disagrees with BW first, I can play until finishing the first farm, which should make us know more about the AI situation etc.