Well I never got around to installing one, though I had plans for it. I even bought the harnes that connects into the ignition switch harness and has the connections pre-made for a remote start harnes so that I dont have to cut and splice wires.
So, my advise to you, mainly because I love options on modifications where if I want to return to stock I can do so without hackin' up something, is to find someone with that harness. When I get my car on the road, I have intentions of putting a remote starter in there though I dont care to have an alarm or anything like that.
Seems you and I have similar plans, but I cannot answer your question regarding if a newer model remote start can be retro fitted to an older model. If it can be, I'll be hunting one myself as I would much rather keep the factory FOBs.
I will just say see if you can find someone selling that harness (I paid $20 for mine I believe) as it will save you or the installer from having to hack into the wiring. I dont know where to find them as I just happened across someone selling one and bought it. Hopefully someone else can point you in that direction.
I suppose if push comes to shove, I can look up the connectors and see what kind of trouble it would be to makes something like that harness.
