my dad has a 1999 Intrigue and does not have the keyless entry. My 2000 Intrigue does. I tried to program one of my extra transmitters to work with his doors = it would not work.
For $10 on Ebay a transmitter may be worth a try. If your car has the RPO code for keyless entry (look inside trunk) I would give it a shot.
AU0 Lock Control, Remote Entry
A90 Lock Control, Rear Compartment Lid Remote Control Electric Release
I never use the keys to open the doors or trunk. And it is nice to have.