Of course the actual solution is to get rid of US citizenship. In the meantime for things like stocks, can you use a mailbox address or get someone to let you use their address? You’d need some sort of documents to be linked to the address for manual verification if denied automatic acceptance by any platform.

It’s annoying but possible. If you don’t have any one you can try this with in the US, it’s a long shot, but m I wouldn’t mind helping out. You can see my bio on HN and from there you can see I use my real identity. To help with initial trust.