You might be interested in https://kloak.app I believe. It's a privacy-first alternative. It's still in early alpha days, but have most of the things set up. Oh, and we’ve got voice channels with screen sharing in beta too.
Seems to me you're just re-building discord.
Our goal is to implement end-to-end encryption for DMs so that even we can't read message content. But we're not there yet, since after all we need to make sure the platform is safe and not to shield illegal content being sent."
This is a message from one of their founders I found while exploring the app.