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I've never done this, and going through key replacement, I can answer #2 for you.
You MUST buy the physical key at a dealership. It has to get coded for your car. You also need to provide proof you own the car before they even order it for you. Expect this key to be in the $300-$400 range. (E chassis car comfort access keys were $200).
This video shows other retrofited features never even offered on the MY BTW...so you'll probably need to pay up for these to get all the features:
1. Remote start
2. Power trunk
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