Ok, I humbly think the problem is the basics, that are not well defined.
Forget about the technical way (crypto-parties, blockchain, etc…) that is not the most important.
- Why this community would be for ?
- What would be the rules to have the right to enter this community ?
- What would be the benefits for its members to be part of it ?
- What would be the interactions with non-members ?
- Who can decide what and how (unanimity ? 51% consensus ? etc…) ?
Once this is defined, gather some people, refine all this, and after that you will be better equiped to choose between different technical solutions.
If you look at Duniter, these questions were answered mainly in the TRM. People gathered around it, remaining questions were discussed, and after that the small group decided to choose some technical solutions (blockchain, WoT) and write Duniter.