Hey Angus.
Watch the police on the GOR. It's not the delight that it once was.
I'd keep following the Princes Highway after Werribee and go through Gippsland and throw a left at Cann River and head toward Bombala and then Cooma. Wonderful road with superb scenery.
This will bring you out just East of Cooma so you can either stay there the night (turn left and the T intersection if you do) or turn right and head down Brown Mountain (oh, the curves) and stay in Bega overnight. This is the Eastern end of the Snowy Mountains highway.
For dessert, after getting back on the Princes Highway just north of Bega, turn left at Bomaderry just north of Nowra (it's about a 200Km run) and do the Kangaroo Valley run through to Robertson and then down the Macquarie Pass to Wollongong.
You could then get to The Putty Road to Singleton and then pick up whatever choice you have to get back to Brisbane. You'll then have ridden some of the best biking roads in OZ in one run.
Linz