For making the newcomer can't read the former message ( I think this is crucial, cuz it's the CORE feature of WeChat groupchat, and in telegram, you can read the message before your joining, that nostr have already solved ):

When every time newcomer came in, the chatroom nesc changes ( automatic, UI senseless ), like HD seed or Merkle Tree, and so you can not read the message before, but former people can read the following message.

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#[6]

Hope it will help you, I’m sharing the idea of encrypted group chat we’ve discussed long ago but neither of us is good at coding for clients.

Talked to several devs before, said it will be possibly realized, hope this can give you some inspiration.

Best regards!

#[2]

This seems easy to implement and it's pretty much what I have in mind. Could be interesting to implement it this week or next.