This is somewhat similar to the experiments I’ve been doing with protest.net on nostr. So far I have ditto and flockstr but it’s not got the inward community focus figured out. 

You said nip-07 but what I think you meant was nip46 hosted nsec bunker like how fountain works. Users can have their nsec but day to day it works like logging in to a normal service on the web. Think Coinbase service for nostr.