Not sure about Australia but in the US you can get Homelink on the BRZ, and by extension it should work on the 86. Subaru part numbers are:
H501SCA100 (mirror)
H501SSA040 (Adapter)
Comes straight out of the official Subaru accessories catalog.
I've not used it, but I have friends that that have "
Flash2Pass" and love it. I'm probably going to go that route because it works on any vehicle, including motorcycles.