Reprogramming remote Key
I think the best the cheapest way is... buy a car with SmartKey.
Because the SmartKey is a totally different security / ignition system, and everything is operated by the remote (radio / infrared), themetalkey can only be used for un/locking door, trunk and glove compartment.
I think your best alternative is get one of those flip-keys, (key folds into the remote), used before SmartKey, Audi /VW currently use them too. There are many aftermarket look-a-likes, so you might want to look around.