Interesting concept, you couldn't blame them directly if they do a rugpull but at least trust them more than a completely unknown guardian. But there definitely exists no software to do this yet.
Discussion
It's possible to proof group membership without revealing who you are. So you could have just what nostr:npub1ah3aj4mhfew4c7txfdd4paf3wr5syntkeyxenl9fxf9rejte2wpqwcl76e was referring to. You could use nostr keys for that but the group would have to collaborate to generate some setup ... I'm not a cryptographer but I'm sure it's possible.