Has anyone successfully retrofitted "comfort access" into a R50/2/3?

It would be a cool thing to have.

 

If you're talking about the ability to lower the top using the key fob, there is no retrofit. It just needs to be activated by the dealer. I had mine activated about 6 months after I bought the car because I didn't know about it when I bought the car.

 

No, I am talking about having the key in your pocket and it unlocks the doors when you are close. And then allows you to hit the start button (MINI has a retrofit kit for the start button already) to start the car without ever removing the key from you pocket (i may have this part wrong).