When I bought the car, the financing guy tried to get me to buy the alarm for $595. I laughed and told him I could get an alarm installed at the same place I get the windows tinted, so forget it. He finally dropped to $300, then $95 and I let them leave it in for $95. My lock/unlock function is not subscription based, so no worries on this car, but if it was, the same aftermarket alarm would lock/unlock it.
The car also came with a 6 month Sirius/XM sub. I have several portable Sirius receivers with car and home docking cradles and lifetime subscriptions. I'm just going to mount one of the car docks in the car, hook up BT and pair it to the car and use it for free until the car dies, 30 yrs from now. Or Sirius gets obsoleted by Elon Musk's free satellite service. Imagine if Elon decided to put the satellite TV arseholes out of business! He's already building cars, rockets, spaceships, internet satellites/receivers, a satellite/5G cell phone called Pi, a tunnel boring machine, flame thrower, portable nuclear reactors, massive grid size battery banks, home solar panel systems, home battery systems, and HVAC integrated with hot water and radiant heating coming soon.