As far as I know, the exclusion of US / China registrations was only enforced at the web site level by Block.one. The underlying smart contracts that perform the registrations don't care where you are located. That information is not stored on the blockchain, so once registrations are done there's no way to distinguish a registration that was done using Block.one's tool vs. some third party tool. So I wouldn't worry about this overly much.

As long as your EOS is included in the ERC20 snapshot then you should be good. You can verify your account information using the excellent account checker tool provided by EOS Authority: https://eosauthority.com/