Have you visited Dancing Rabbit?Unfortunately I'm in a location where I can't experiment with it right now, but I know some people who have and who used composting toilets of various sorts long-term. Locally Kelly's Working Well Farm does some, and non locally Dancing Rabbit Ecovillage uses it. I've explored and used both systems and seen the resulting compost. The compost is rich and amazing, the systems don't smell, and it grows things well.
I think humanure systems are great and from what I've seen they're an amazing alternative to today's water usage. Given that even low flow toilets are a gallon per flush, not to mention the way waste water and human waste is treated, I think it's a much better way of managing human waste than our current system. It's very clean and effective.
At dancing rabbit they have a system where a few people go around a couple times a week and gather buckets of humanure from public buildings and private houses like trash and give them clean buckets. The buckets are layered with sawdust. Then the buckets get emptied at the compost pile, covered, and the buckets washed with toilet brushes. They get cleaned and returned later in the week. It's all very efficient and could be done on larger scales too and I wish we would.
I follow them on Instagram and think the place is fascinating.