I wouldn't say the 50hr bush course gives you a big leg up on other people. At 200 hours, 50 hours is a lot of time. In the grand scheme of things, it's one months worth of flying for the average line pilot. Additionally, many of those courses that I know about do the course with a 172 or 182 on floats...not exactly the Beavers, Otters, and Twin Otters that many of the northern operators use - although, there are a couple 182 operators out there.
In saying that, the course will give you exposure to the Canadian system, which is not a bad thing; there are considerations that you'll need to take into account here in Canada that you wouldn't in Australia.
In any case, sounds like you've got a good attitude towards working the ramp for 2 years, which like it or not, a 200 hour pilot in Canada will probably have to do unless you instruct.
Good luck!