I "think" that the parking controller is too insignificant to be covered by CP, but if it is, then it just a case of taking your car to a VW Group Indie that has the correct licenses for the official VW Group tools to remove CP - that is as long as that used parking controller is not reg'd as being stolen.
I have bought a used Audi DAB radio in the past and trusted to luck, and that worked out okay, the time charged by my local VW Group Indie was under 0.5 hour, which in my mind was okay!
Edit:- I bought a proper PDC sensor hole cutter, and that cut the holes from the outside in very well, also depending on the colour of the bumper, Audi at least, sell 2 different colours of "washer" that gets fitted over the parking sensor, some other VW Group brands only ever use the black ones, but there are also translucent or white versions for lighter colours.