...I'm on my second year of failure trying to get a BSFL composter working, btw. and while they are a good supplimentary protein source, over the long term, the rest of the diet needs to be balanced around them, if that's going to be your main source of non-plant prtein and amino acid profile.
In past centuries, we expected MUCH less of our poultry, and they got by on the scraps/leavings - but it was a varied menu because the farm also had a cow (or more), pigs, grains, a robust veggie garden, etc. There are even old feed recipes for chickens that involve removing all their water, feeding mixed grains, and having them drink skim milk!
You start taking away those sources of variety - the cows, the pigs, the garden plots, and suddenly the chicken's diet excludes both the feed those other animals missed, but also the scraps and excesses OF those animals - and the whole system falls apart.
Modern society is based on highly efficient specialization. Doing one thing exceptionally well, and trading all over the State/Nation/World for everything else you need. Sustainable homesteading involves inefficiently doing a lot of different things, just well enough to keep juggling. Its a completely different mindset. and skills set.