Hi and welcome to the Forum.
I have visited Aussie land a few times as my son has emigrated and works in Sydney.
A few pointers to consider:-
1. Can you emigrate as they have some pretty stiff rules regarding who can reside and for how long.
2. Unless VW Australia decide to offer the California then a private import is possible, but not straightforward.
3. The T6 with its Euro 6 engine and requirement for Adblue may not be the best option if no-one is prepared to service it.
4. I would seriously consider a homegrown conversion/camper for the Australian market. I know its not a California but at least servicing and repairs will be more easily arranged and it will be built to take account of the local environment.
Anything is possible if you have the funds, just wether it is practical all round.