Surely The Nullabor is the perfect opportunity to install a few solar superchargers? Space them a bit further apart, say 400 km apart. Put 50 kW of solar and a few PowerPacks, you would not be charging many cars and can always add extra later once established if needed. A massive publicity opportunity as almost all very remote power is diesel generated therefore negating a lot of the benefit of EVs. The original investment for the superchargers was included in the Model S price at around $3,000 a car to so they should have some spare cash to deploy into this with over 500 Model S in Australia already.
Please not 400km apart, the best I can do is 350km on a full charge in range mode with an extra 5psi in the tyres in my 70D and a 60 or a base Model 3 would be even more stranded.