First of all, don't quit your job. That's just not smart in this current climate.
What ahks says is right, even if you have a license, it does not mean that they'll accept you. Yes, you get a HK ATPL once you finish in Adelaide, but that's irrelevant.
However, if it means that it'll help you with your confidence, do it in your spare time. If you have a long vacation, do it then. You don't need to get a PPL, you may just need a few hours under your belt. This will do two things:
a) Tell you whether or not you can handle flying in a small aircraft, and
b) Tell you if you actually do want to do this as a job.
And as for doing it for a career other than Cathay, it's up to you. It's a rewarding career if you can make one, but it's hard work either way. A lot of people make the mistake, going into this thing just because they need a job. You have to be a bit more committed than that.
Surf enough of this forum (and others), you'll quickly appreciate what it means to be a pilot.