Steve,
I'm not aware of any individual schools with formal Aussie links (but I'd be interested to hear from any that have, as I'd like a link for my own clients)
You could try the Australian Maritime Safety Authority. They have quite a good site I have used when I needed to check for one of my Yachtmaster clients who was heading to work in Perth:
http://www.amsa.gov.au/Marine_Qualifications/
I'm not sure how appropriate it will be for smaller boats, but may be a good place to start. I also spoke to the Technical Dept at the RYA (RYA schemes now operate in Australia so there is an established link which may prove helpful), and they were very helpful indeed over the phone