Just checked and it depends on model spec, not year. You either have SKIM factory fitted [your Jeep key is grey] or you don't [your Jeep key is black]
If you have a grey key, setting up a kill switch is pointless and far more likely to fail or be forgotten than SKIM. Your car is already immobilised when you remove the key.
If you have a black key then you could get an aftermarket immobiliser which would be far more practical than a kill switch.
Tendency to fail with age is not a noted issue with SKIM, and since you can't remove it if installed, then a moot point.