I think just go with either Australia, whichever capital city is appropriate for the state, or even both.
We don't get that many posts that further separation is worthwhile IMO, that's a pathway to ending up with a bunch of communities that appear dead from lack of activity (which can be a bit of a self fulfilling prophecy - people only tend to post in places that seem alive). I think we've already fragmented discussion more than is ideal between splitting off news/politics/questions/environment/memes from the general Australia community, regional interests are more understandable but the existing city/state comms are already quiet enough with our current userbase.
It is a fair point that subsidies for the cars have often been benefiting those who could afford the expensive car anyway, but surely their idea of subsidising home and work chargers is also benefiting those with more money. The subsidies would after all be primarily going to those who own a house with enough space to put the charger (i.e. not much luck for renters or apartment owners) and those who have allocated parking at work.
What is really needed to drive uptake is both cheaper EVs (to the point where they reach price parity with regular cars) and a charging network widespread and obvious enough to give prospective buyers confidence that they can charge even on their less common routes. Significant progress has been made with this, we've come a long way from the early days where cashed up people would smugly advise buying a 90+k vehicle to save a few grand on petrol.
I think promoting electric motorcycles and scooters would be worthwhile too, they're more affordable, take up noticeably less space and resources, and still provide much of the personal transport requirements of our current road network.