Hi Phoney,
The Eyre Peninsula is well worth the drive from Sydney will not disapoint. Would be close to be being equally windy as WA very consistent winds. December can be very hot but this usually turbo charges the seabreeze. The peninsula has it all from flat, waves beauty and the beast. From Whyalla your first stop on the peninsula along to Pt Lincoln plenty of spots to enjoy along the way. No need to travel far each day to find something new. After Lincoln through to Ceduna is Gods country plenty of wildlife and Natural beauty. Wifey will not be dispaointed. Just be aware you will not be kiting in a crowd till your home again. Just try and get as much local info before heading off, consequences off heading into the unknown can be nasty.
One thing for sure you won't find a more chilled out zone locals are very welcoming and there is an ever growing community of kiters.
Book your holidays and get over here.