Hi Laurence,
There are few rules on this forum but one is that you must not name consultant's so best you remove the Drs name you gave. It may seem pedantic but there are good reasons for this.
Sorry I can't advise on how Heidelberg University Hospital rates on surgery for Prostate Cancer or if they will do RP after RT. I know they are one of the leading European Hospitals for Pancreatic Cancer and have possibly the most advanced Hadron Treatment facilities in the world. They were the first hospital to do Stem Cell implantation and with the DKFZ developed the 68 Gallium PSMA test so have a good and far reaching track record. You can get an idea of this from this video : https://www.youtube.com/watch?v=2cRYaIJXbvI
I do know that there is close liaison between Heidelberg University hospital and Dutch colleagues as it was mentioned to me whilst I was there so maybe your contact can help you.
Just as food for thought, when the Marsden referred me to UCLH for possible salvage HIFU, I asked about having my previously radiated Prostate removed instead . I was told this risked an 80% chance of permanent incontinence and it was not recommended. How glad I am that I had HIFU instead. Your body your choice but maybe worth exploring before proceeding with RP.