so there are a couple of options there. You can rebuild the harness if you are keen or just trim out those wires. I would most likely go down the path of grabbing that harness of a manual C30 and swapping it in.
While I am fine to swap all the computers that are coded I'm an IT guy so playing around and getting it reflashed is kinda exciting and fun to me. Plus no one has ever reported doing it on the forums which is interesting in itself so I'd be happy to be the first to do so.
With P1's you need to get the CEM pin which can be done through a VIDA reload or you can read it out with a BDM reader. Being that I don't have a way to get a VIDA reload done without a lot of cost I'll probably get a reader to get the PIN which I'm already working on for the AWD conversion as I would like to correct some of the CEM/ECU programming to fix some niggles in that conversion.