Well I am sure that there are carib banks that will do anything that you ask, but you'll still need an omnibus account at a BD. You need a foreign BD that will operate in the SEC space. The problem is that these firms are crooks and will not have any remorse when ripping you off.
Seems to me you may be going about it the wrong way. I would never, ever advocate for an illegal nor even a questionable solution. Will private message you some thoughts.