Unforutunetly with Rom daughter boards you don't have many options in Austraila. You could simply find a Rom daughter board from japan with a set tune for specifics like 264/265/0.8/ +/- 4throttle.
The main problem with using these are the following
1. Fuel
2. Climate/Pressure etc
You would then need to readjust it with something like an SAFC. Really this is just a cheap bandaid and may end up costing you the same for something like an Adaptronic/EMS Stinger etc.
Plug and play options that I know of are
FCon (Apparently there isn't many people that tune these)
Power FC AP Engineering Edition(These are only available Second hand now)
Razorback (Contact Foxtail/Sam )
This is only a little bit of advice, im sure others have things to add.