Keep your address in Australia and stay with your Australian TFN. Most important thing is to retain Australian Tax Residency. As a property investor there's significant tax concessions. Don't lose them to a f*cked up tax system in Thailand
Unlikely a DTV holder will ever interact with an immigration office so it'll never be picked up. I used to do it all the time with the OA. In four years never did a single 90 day report and never got fined