I made it!
Thanks for all the ideas and support guys, there was no way I was going to have the necessary tools for the problems I encountered. After starting the trip, the hydraulic clutch gave way in Forster Vic (issue with the master cylinder!) - no phone reception either!! called racv off a payphone and was told the car couldn't be looked at until monday. Then had the bright idea of push starting the car and from that I managed to limp the car back to Melbourne (a few bobsled impersonations pushstarting the car later).
The trip was then restarted on monday and due to time constraints I ended up taking the hume hwy instead of the coastal route. The car performed faultlessly, not missing a beat over the 25-ish hours of driving.
I must say, I did end up using the 'camping' function where the seats fold flat - NOT VERY COMFORTABLE!!
Quite a few bumps and slopes in the 'bed'.
All in all a nice drive in a nice car. I believe the car has a 'highway' diff fitted so the car wasn't too stressed.