Welcome to the Nexus Heff! Extracting your own batch of DMT is the way to go, and is quite easy after you find a source, and you shouldn't have much difficulty in smoking from a bong with the right technique, or you can just make some enhanced leaf if you manage to find a source for your own extractions. As far as finding sources in Australia, I wish you luck. As far as I know Mimosa Hostilis is controlled more rigidly. Hopefully a fellow Aussie will be able to toss you a line regarding that one, I'm sure there's some threads concerning similar complications if you run a simple search.
Best of luck, and welcome!
The only hell for a warrior is peace.
The warm fuzzy side of the cold hard truth.