Isn't there a 100% import duty in Bahamas? If so you might consider sailing back to Florida. Volvo Penta's main office is in Virginia, or somewhere back there, I'm sure they could direct you to a dealer. I'll see if I can find a name and number for you, I have a contact I can call that might have some info. What year is it?
One option is to call around to Volvo Penta dealers to see if they have any boneyard engines that they'll sell you a used pump off of.
The MD2B used a Bosch PFR 2K 75A/381/11 injection pump. Call around to diesel injector service shops and see if they can source the Bosch parts. If they can get Bosch parts, the price will be a lot better than the same parts in an official Volvo Penta box. (If they can't get the parts, Volvo Penta likely can't get them either.)
It might not be a bad idea to have an injector shop rebuild and calibrate your pump in any event.