I have driven the Nullarbor from Perth to Adelaide and back to Perth, it is not that bad at all.
It also depends how much time you want to take for it and if you want to do some stops.
Especially when you get to Norseman, up to Kalgoorlie then to Perth, or go down to Esperance to Albany.
If you would like to take the car up to it's topspeed, you can.
But it would be more fun to put it on a truck to Perth and worry about the guy who parking your car ready for pick up, he will be tempted to burn some rubber.
it's just an idea, take your pick.
anyway good luck

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In a Subaru you can cover a great distance in a short period of time or a short distance great period of time.
The journey is more important than the destination.