Thanks for this information and write-up! Do you think that the public domain composting toilet rule would apply to something like Wendy Howard's vermicomposting flush toilet
http://www.vermicompostingtoilets.net/? It's public domain and composting, so it seems to me that it would apply under this rule, but it's slightly different than the average composting toilet.
I would love to fly under the radar, but we are working on a new build, so it will have an inspection. I'd rather put in something that we would actually use, rather than wasting money on a septic system that's just for show.