Let me know how your progress goes. This goes beyond just performance on mobile. Users can have ownership of their data and grant or revoke fine-grained access per app as needed (even for relays, Blossom servers, etc). This is what Tim Berners-Lee is currently working on: https://solidproject.org/ (not sure if you’ve come across it before).

It would be nice to see a Nostr/Solid hybrid. If you’re interested, I’d be happy to collaborate on getting a PoC running.