Hey Badger,
have you seen that plumber fly in fly out 4k a week job on trade me?
only have to be registered i think, not much info except tropical, rough conditions, long hours in the heat. modular experience required.
Probably P.N.G  or some where where the natives want to kill the white invaders or amongst Nauru rebelling refugees perhaps... be similar to the top of the south aye!
I'm sure that something will come up for you, as we know certifying gasfitters dont grow on trees and i suspect will be becoming rather rare soon.