Maybe I can help answer one question: Yes, the charger will handle 220V 50Hz, it is the same as the European, UK, Hong Kong and Singapore standards.
As I understand, there is no current dealer in Australia... Unsure of the import regulations for new vehicles and the type approval required to license on the road where you are. It's easy enough to purchase and import an Enertia, the challenge would be getting a plate on it to use on the road.
Hope this helps in some way...let me know if you need more info!
Thanks!
James