Guys with a Brit passport there is not much to worry about on the visa side - you should try a wee airline based out of Nevis and St Kitts - 'Nevis Express'. They are often looking and have a few islanders and might still have a couple of 1900c's. The DO there is Sean Heanville. The office is right at the Nevis airport and once down there it is pretty easy to jump seat around with your ID. Good luck, its a chilled out place with easy hours (30 or so a month). They fly N registered a/c so an FAA license is a must.
Good luck if you get down there let me know.
Cheers
Juba