I don't have a specific surgeon suggestion for you but I know part of what you are facing. My husband was diagnosed with prostate cancer and he had the option of surgery or radiation treatment. After hearing how radiation had the potential to harm his rectum he elected surgery. He'd witnessed enough with me to know he didn't want to risk rectum damage.
I had great doctors at the Mayo Clinic in Rochester where I unfortunately had to have my j-pouch removed. I have no idea where you live but think any of Mayo's locations would have surgeons experienced with removing your prostate while being mindful of your j-pouch.