In short, no I don't agree with foreign bases (be that cabin or tech crew) if they're made up of almost exclusively foreigners doing a job that could be done by Australians, preferably in Australia.
The idea of Australian nationals based overseas is great, however this was shown to be a failure with the LHR base which started with plenty of Australian nationals but has dwindled down to very few.
Anyway, I've had enough of this lowerlobe... (wish there was a smilie with a white flag!)