I dont think you need to travel to LOS for those courses. Im sure there are dive centers in Australia where you can get those courses done and then you can fly over to LOS to do whichever type of dives you feel you might enjoy eg. wreck dives, deep dives, drifting, night dives, photo dives etc..
you might also want to do an intro dive first before committing to a course. a mate went right for the course only to find himself nauseous when breathing through the regulator and he couldnt figure out how to equalize so he never completed the course but had to pay for it anyhow.