Memory tells me that a CASA licence holder is permitted to fly a foreign registered aircraft within Australia, which includes the appropriate privileges of his/her licence, but my memory doesn't stretch to giving you a reference sorry! That may mean an appropriately rated instructor could do some types of flying training with you in your aircraft. The roadblock to most training activities will be CASR 61.195 and some associated regs, I think you will have trouble finding a Part 141 or 142 holder who is permitted to exercise their certificate privileges in a foreign registered aircraft, or at the very least who is prepared to argue the point with CASA when challenged about it.