All I can say is that I have been driving around for five months with Tassie plates on and haven't been questioned once by Police, but I think I have been lucky and don't drive like an idiot. The car was brought in Tassie and the registration was changed into my name there as well, so it's a bit different to your situation. When it came time to re-register it I requested the papers and sticker to be sent to my Perth address, paid the money and sent it off. If I do get stopped by the fuzz, I'll be saying either the car has just arrivied in perth, or it is going back to Tassie very shorly and therefore not worth changing over to W.A plates.

What I should really do is just bite the bullet and put it over the pits here. Get it over and done with. Save some hassle.