This seems like a bit of an after-thought to me? Deciding to finish your PPL is a big decision, but deciding to finish it at the other side of the world is an even bigger decision, particularly given your limited time to plan - and presumably fund - it. Having said that, spontaneous decisions aren't always bad ones. Obviously only you can decide for sure whether you will be able to afford to live there for the duration of your training, as nobody here knows your personal circumstances. But don't rush into this; you have lots of time on your hands in future and the cost of a return flight to Australia is a whole lot less than the flying you're talking about doing.
