I have also considered this for the 6 when (if) they ever release one. Got in contact with JBR and as you mention above, the main reason they can't list it as fitting RHD is due to the lack of RHD vehicles to test on lol. So it would take someone taking a punt and getting one to pave the way for the rest of us! Go for it lol. You could always try ask JBR for a discount on the basis that if it works there is likely to be a flood of Australian orders to follow
AP V3 (Rayd tuned) / CP-E CAI / CP-E TIP / JBR Trilogy / CS Front Strut Brace / JBR SSP / JBR Shift Knob / JBR shifter bushings / Eibach Pro-Kit / Bilstein B8's / SURE Juggernaught / SURE Dreadnaught / Whiteline RSB / Toyo Proxes T1R 235/40/18 / Evo X BBS rims / Turbosmart Dual Port BOV / CP-E DP / CP-E TMIC / Autotech internals / Superpro bushings
Future mods:
BT, DM OCC, EGR delete, Braided clutch/brake lines, Hawk HPS 5.0 pads, DBA T3 rotors....