Most coppers wont know about that part of the legislation, there are so few overseas registered vehicles in Australia. Carrying a copy of the webpage is certainly useful and has been suggested by a couple of riders on here before. NSW is by far the easiest State to deal with. If you back up a few threads you'll see a reply from the Victorian Roads and Traffic Authority about recognising the NSW overseas vehicles arrangements, I'm still waiting for Queensland to reply (5 months?).
Its one of the problems of having a federation of States in that we can have different laws - much like the EU and USA.
You maybe wasting your time trying to buy third party insurance as this is always linked to registration, but I doubt there is an insurance company that wont take money - whether they pay out is another matter.