Can you take a look at much newer solutions: snowblossom (proof of iops of storage with large snow fields &nyzo (proof of diversity) both written from scratch in JAVA, both are working now:
quick intro of the 2 projects online:
Snowblossom https://fx-c.com/cryptocurrencies-that-will-change-the-world/#Snowblossom_SNOW
nyzo https://fx-c.com/cryptocurrencies-that-will-change-the-world/#NYZO
I think they may solve some of the problems, but they are too new tho, newer than most other projects. and almost no one is talking about them now.
I hope you can join their discord to talk with the developers of above projects. They are active on discord.
more info about nyzo and snow: https://medium.com/@flashygordy/teamtalks-19-nyzo-aa4a24748aa2 https://medium.com/@flashygordy/teamtalks-24-snowblossom-39aca646815f https://medium.com/@nyzoco/the-nyzo-mesh-time-and-diversity-as-a-currency-85c676631516 Note: None of these were written by the coins developers or team members nyzo developer is anon