[KevinH1990]

The issue with "starting from scratch" will be the cost. One of my coworkers purchased a spare key from Porsche and if I recall correctly, it cost him close to $300. That was several years ago, and I expect the cost is higher now. If you have to buy several components, I expect that the price will cause sticker shock. There is no harm in asking the dealer, but make sure your sitting down when they tell you the cost.

If I was in your situation, I would consider contacting a locksmith to determine whether the door lock can be modified to work with the key you have. On my car, only the driver's door has a keyed lock. I'm not sure whether earlier cars had a keyed lock on the passenger door. This may be the least costly option. However, it won't be as convenient as having remote locking and unlocking.

Good luck.