Welcome to BPL.
There's a few of us poor gear-deprived Aussies on this forum. And of course there is Roger C, a doyen of this site, with lots of great ideas on how to make lightweight bushwalking work on a local scale.
Regarding your needs for a cook system, I have a a 950 ml Molsen beer can that I will send you if you PM me. (It's a Canadian beer that bought while visiting Quebec, purely because it comes in big cans) Sadly, there's no beer left, but it sure beats our 375ml cans that we have here in Oz.