Yes you can:
Buy and sell uncomplianced cars
Compliance the vehicle at any shop
Ive had it done myself. I bought a car that was brought into the country 5 years before i got it, and it wasnt complainced immediately; i got it ready for compliance and had it done at a shop other than the one who had brought the car into the country.
Also the easiest way to check if the car can be complianced is to call DOTARS, as they know about all cars brought in and whether or not they can be complianced, but they take a day or ten to get back to you.
For people in vic call Sam at Japanese Performance Vehicles in Bayswater.
Hope this helps potential buyers.