Instead of dropping in food, seal in all your farmers with the children and the farm plots, and have them drop food out. That way you can take advantage of child harvesting.
You only need a single adult dwarf to build farm plots and mood workshops, and once those are built you won't need any at all. Raw materials for moods can be dropped in from above, and harvests can be set to dump down to be processed by brewers / cooks / weavers.
Children that produce artifacts are allowed to become artisans according to the nature of their works. All other dwarves take whatever non-mooding job (cook, soldier, hauler, etc) is needed at the time they mature.
Stick the Hammerer in there to maintain discipline; hopefully if enough children are brutally murdered for crimes they didn't commit the survivors won't care about seeing brutality once they get drafted into the militia.