Hi Brendan, welcome to the forums. The PACPrint trade show will be held in Melbourne this May 26 to 30. I would expect that some
DTG machines will be showcased there. Anitech is the Kornit distributor, and dGsMimaki carries the GP series (my choice is the GP-604D). I'm not sure if they have offices and demo machines in Melbourne though. Might want to make some phone calls, but I think it will be worth it to travel to their offices (sydney or elsewhere). There's also a local Australian company
DTG developer. The name is Arakis and they are on to something good, using Spectra printheads and valve system for the white ink. I think theirs is a really promising machine. Lastly, I've read that the new
DTG Viper (epson based printheads) was manufactured in Australia too.
Good luck in your search and do give us an update.