Project Ozone 3, Enigmatica 2 Expert, Nomifactory, GregTech New Horizons, Sky Factory 4, and SevTech Ages all run fine under GNU/Linux, is there some modpack that doesn't work?

Presumably it's because of Bedrock. Which is the inferior game, yes, but it's the cross-platform one.

Yes, because all their friends use bedrock on tablets/switch/etc.

Minecraft works just fine on Linux.

If you can get bedrock working on it, I’ll be happy to follow your steps. None of their friends play java edition and it’s not compatible with their realms.

Pretty sure I once tried Bedrock in Wine and it worked.