Granted, having more months to move things to 1 tile from depot only helps so much - it seems like if the goal outlined in OP would be even hauled to depot in a year there would need to be equivalent of auto-transport stone quarries, expect for food.
For the record, I would have loved to see Breadbowl become what you describe here. A well oiled food-production machine, with dozens of workshops and minecarts delivering ingredients to them and food/drink to the depot, would almost certainly have been able to meet and surpass the production goals I outlined in the OP.
But Breadbowl is a succession farm, emphasis on "succession". Efficiency was never likely to be our strong suit.
And hey, we might not have met our production quota's, but we told a damn fine story in the attempt. I'm extremely happy with how it all turned out, and that's why I'm okay to end it here. Or not: people seem to think we can yet make another go at it.
Sorry about repost, but I propose a third option:
C) Restart from Migrant's half-year save. And give Luneya the reins, as he (or his dwarf, rather) will have the nightmare of Ongul killing 63 dwarves. Then the order to barricade the unguarded bridge should be given.
Opinions?
We're not going to undo people turns, that would be unfair to the overseers.
Either way, migrants might be necessary, though with further traps and more population might be able to manage with just visitors and children growing perhaps?
The only thing that should prevent migrants from arriving is the deceased list.If we clear it, we should be able to rebuild our population in a year or two.