Anti Theft Devices You Can Install

[dmsfrr]

Run the car on an electric fuel pump with a toggle switch in an easy to reach but slightly out of sight position. The car will likely go a block or so on the gas in the fuel bowl.

My daily driver has keyless ignition, as long as the key fob is within a couple feet of the dashboard.
An aftermarket electronic automotive alarm system may(?) be able to shut the ignition down after it gets a certain distance away from the small remote in your pocket.