Insurance Companies - at least some of them - will insure your precious import comprehensively as it arrives in Australia.
Points to take note of are...
* Upon arriving in an Australian port, you can get your insurance company to cover the car for the usual things according to the PDS
* Since the car will take months to get through procedural matters, you may decide to insure the car at first, for fire and theft Vs full comprehensive
* You need to supply the VIN Number
* You do not need to have a Registration Number; nor would you have one (unless your plates are on order)
* You need to have proof of ownership from the agent and country that the car was exported from
* After compliancing and registration, you then need to update your insurance company with Modifications, Engine Number and Registration Number
* If your car is insured for fire and theft only, you may then upgrade to full comprehensive after registering it
Forewarned is forearmed.