Your best option will be to speak to SMATS in Hong Kong - www.smats.net or email
hk@smats.net
They are licensed Australian mortgage brokers and licensed Australian accountants. No charge for their mortgage arrangement services and they will get you a cheaper rate than you can get going direct to the banks yourself due to their volume discounts.
Plus with their tax/accounting division they will ensure you are structuring your property to maximise the tax efficiency of the investment as a non tax resident - building tax credits to protect against potential CGT in the future or future income earned as an Australian resident.
They've been in Asia 17 years so definitely know their stuff!