Well, at last I bit the bullet and installed the smartlock upgrade alarm I bought.
What a pain in the back!! I really have concerns for the mental health of people who choose to work under dashboards for a living
In the end, very pleased with the result. Not too hard to figure out, so I'll offer my services to any Adelaidiens who need an alarm installed, for a small fee of... $2000 As if I want to do that again