Had to read the above a few times as I'm not very technical. Are you suggesting nostr will be able to provide better privacy compared to SimpleX? How can Nostr hide the metadata? And last question, is something like 0xChat potentially the way?

Yep, we hope to do better than SimpleX. The implementation 0xChat and Amethyst have is the same and already this new model :)

Brilliant, is there anywhere I can find this explained? Thank you

I've looked into it a bit more and can see myself taking advantage of your nip but no common relays or relay implementations really support it right now so will just wait and observe.