I bought my D reg Plane 5 years ago from the previous owner that was based at Braunsweg EDVE. So all paperwork could be done at the same place. Maintenence people should do radio and transponder name change for you. I use a facility at Muchengladbach EDLN as the nearest to the UK.
No problems. Enjoy. With silencer and lower noise prop it is 6 dB quieter
that normal.