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If you are on a 15 to 30K AUD package a month in HK, and can't raise some creative finance to borrow at 100%, to take full advantage of tax losses in Oz, I can't help you. Whether it be equity or offset accounts or whatever.
Run the scenario from a decade ago- you buy a 500K AUD home anywhere in OZ, interest only because you are comfortable in debt management, and invest your excess cashflow in to the stockmarket. Where do you sit today? Property worth a million, the 2K a month you didn't pay off the loan but invested with tax free capital gains on the sharemarket is worth ( you tell me ) and you have a tax credit of about 300K.
Interest only is a superb vehicle to maintain high cashflow and minimise taxation. It is hardly for fools. That said, a fool will get themselves in trouble pretty quickly through mismanagement of this strategy.