Orangebull: If you ever figure out the answer to your question about an American lawyer working in Belize, it would be interesting to find out what you learn.
When I first started traveling to Belize 10 years ago, I attempted to find the answer to that question. It is no longer on my radar, but here is what I learned...not much and I have no idea if it is still accurate or reliable. My sources were not from any governmental agency, but from in depth conversations with a Belizean lawyer, an American CPA working in Belize and a few business people:
To practice law in Belize, you must be a Belizean citizen (born or naturalized) or from a Latin American Country. These requirements were not applicable to me. I was next advised that an American attorney could possibly serve as a consultant to Belizean law firms (you will not be permitted to sign legal documents, appear in court to represent clients, etc., i.e. you cannot practice law).
The best advice I received was to find an area that dovetails or is complimentary to a Belizean law firm (corporate, serve as a liasion for real estate transactions for ex-pats). Then again, this all depends if you have that type of background, training and experience.
Belizean law is not just a different animal from American law, but a different species. Lots of antiquated common law rules. Good luck!