If you can change it I would look at the Sea Hunter or Undersea Hunter. I don't know what their specific policies are but they seem a lot more rebreather friendly. I went on them last year (OC unfortunately) and they had a big group of SCR divers using their own kit as well as rentals provided on board.
You may want to speak to them about where they get their sorb from as they also have offices in SJ and Puntaranas I think.
http://www.underseahunter.com/