I have come across Harley-Davidson® Garage Door Opener Kit from the USA, has anyone install/used one in australia?????
Why don't you just put the roller door remote in your pocket???
Here is what I did to mine...well similar.....but I have a bagger...so if you have room...here is a thought.
Harley Part #67854-98 (Speedometer Reset Switch)
To make it water sealed, you can get the boot that goes over the switch...Harley Part #67880-94.