pixelfed.org might be what you’re looking for.

I think it’s far down on their list of things to do unfortunately.

Really should have read your edits before clicking those links.

Yesterday I saw a beehaw (I think) community thread which got locked by the beehaw mods but because it was federated ppl on other instances could still comment. I think !selfhosted would be still be up on your instance if lemmy.world went down.