My Progressive policy includes roadside assistance. I believe it was optional, but ridiculously cheap. Don't know whether that's available to non-USA residents.
AAA gives roadside assistance to motorbikes if you pay extra for recreational vehicle coverage. Far more expensive, but maybe an option if they'll cover you. Their representatives are often clueless, so getting reliable information can be a puzzle. It might be that you need to be a member of your local auto club in Australia to qualify for benefits here.
Hope that's helpful.