Management options for pudendal neuralgia after salvage radiation for prostate cancer?

Older patient who had prostatectomy followed by salvage radiotherapy of 66 Gy followed by focal boost to 72 Gy to an axumin positive region concerning for recurrent disease along the vesicourethral anastomosis. Six months out patient has burning along his penis but no real discomfort in his pelvis or perineum. Relieved with lying down or sitting on the toilet but much worse with sitting in the chair or standing. Conservative management has not improved his symptoms and tentatively planning a pudendal nerve block but wanted to see if other folks have had similar scenarios and what options they used to manage it. Presumably this is related to possible scarring and entangling the nerve but it's still a peripheral nerve so it could be a neuropathy from the radiation.