I am looking for a way of splicing a "kill switch" somewhere to make it harder for badguys to steal my wife's 2019 2.0 LT AWD Equinox. Three of relatives and neighbours have been recent victims of their vehicule thefth ans she doesn't want to appear on the list.

I'am looking for a rather easy way to do so and I prefer to, possibly, stay away from the ECM.
The fuel pump circuit might be a good place if I can get an rather easy access to it.

Any suggestions on how to... Please: Chime in.