Moving 1 NE removes 2 hills from the BFC, and adds 2 hills- it has no effect on that.
As to the 3 grasslands we lost that we didn't lose from settling it, one is already in the BFC of 9, 11, and Catan, 1 will be shared by 11 and Neu-Oslo, and 1 is only outside of 11. Meanwhile, most of the ones we gain are only currently in the BFC of Bergen, a city that will have more food than it needs once we capture it and get rid of all that jungle and marsh. So, yes, I think we do have the food for it.
I would say that the next 10 turns would be probably be better played as part of someone's 20-turn set anyway than just 10 on their own, since a good portion of them will likely be spent in Anarchy, which tends to produce rather boring and uneventful turns.
As to the 3 grasslands we lost that we didn't lose from settling it, one is already in the BFC of 9, 11, and Catan, 1 will be shared by 11 and Neu-Oslo, and 1 is only outside of 11. Meanwhile, most of the ones we gain are only currently in the BFC of Bergen, a city that will have more food than it needs once we capture it and get rid of all that jungle and marsh. So, yes, I think we do have the food for it.
I would say that the next 10 turns would be probably be better played as part of someone's 20-turn set anyway than just 10 on their own, since a good portion of them will likely be spent in Anarchy, which tends to produce rather boring and uneventful turns.