Thanks to the suggestion up-thread, I'm now going to fly into MEL, hire a car and trundle down to Sorrento for a night followed by a night down in Lorne and then back to Melbourne. Eating and sightseeing along the way of course.

A different adventure than what I had originally planned, but new territory for me and I'll get to travel on the proper Great Ocean Road!

A big thanks to CPMaverick - I owe you a frosty one which I would be happy to repay sooner rather than later!