Shim, it is like this.
You must be here legally, one year and get a perm. resident card or a work permit to work in Belize as a foriegner. To work on this caye. You must also have written refferal from the village council, which is hard to get in under four months. This I know personally because I have been there. Perhaps you could contact a volunteer force in your country and apply to volunteer in Belize.
Anyways that's the deal. Placencia was the most recent area devastated by Hurricane Iris. That was four months ago.
Thanks for thinking about us, it is a nice gesture with good intentions. Stay cool.