This is from a thread about a car that was reportedly missing both it's fobs: So it may cost at least as much (if not more) to add SKS, if it's even possible. Maybe your best option would be to sell or trade the car for one that already has SKS.
Nope cause you'll need the 4 sensors to be built in for the smart key to communication, you'll need to get the smart key front door handles with the touch strip and the black buttons. The same goes for the rear hatch where you'd have to wire up the rear hatch release button to unlock with the smart key and the have the black lock button and finally the $300 smart keys. You're better off trading cars.