Replying to myself.

Article about growing chocolate in homes/greenhouses.

https://practicalselfreliance.com/grow-chocolate-tree-indoors/

This might be doable as a co-op.

Edit: they got about 5 beans from one plant.

https://en.m.wikipedia.org/wiki/Cocoa_bean

To produce 1 kilogram (2.2 lb) of chocolate, around 300 to 600 cocoa beans are processed.

20 to 120 trees per kilogram of chocolate.

Note this is not the same as a finished candy bar or baking chocolate.