I never imagined you have that many kangaroos there. Not too many of us Europeans think of them as threat and a burden. They're cute I have to say, but so are foxes in here as well. What we still have left to hunt is wolves, rabbits, deer and bears, and I guess some types of birds. Germans love to come and hunt our bears, I guess they cleaned their forests. I haven't inherited hunting from my grandpa and I know why. If I would have to kill for the meat I eat I would definitely become a vegetarian again. I get your situation though. Excesses need to be cut.
There's an estimated 60-70 million across the country with population growing rapidly. We don't go around shooting them for no reason of course and my shooting is culling not hunting, there's a difference.
Many people say the same as you about turning vegetarian if they had to provide their own meat; Most are happy to eat meat as long as someone else kills it for them and they can buy it from the supermarket.