[MENTION=20005]Matthan[/MENTION] Yes, it sounds like a great concept and background! So the idea is the twin diamond amulets that disappeared with La Gloriosa will allow your PC and the Loa to be separated and for the Loa to exist separately from your PC? Cool!
Btw, don't worry about being exacting with the history. We're playing in the "Golden Age of Piracy" with secret cabals of wizards, seawolves, merfolk, and lost islands after all!
After reading your character's background, I was reminded from something in Green Ronin's Mythic Vistas: Skull & Bones book, which this campaign derives inspiration from....
Saint Domingue is theoretically under the stewardship of the French Knights of Malta. Skull & Bones posits a what-if scenario: what if the Knights of Malta have been corrupted by a cabal of French noble occultists? They practice poisoning of rivals, perform twisted Black Masses, and attempt to seize both land and slaves in a power grab.
There's possibly a tie-in there for your PC's background!