https://www.livestrong.com/article/391418-the-best-bicycle-seat-for-the-prostate/
https://www.bicycleseats.com/prostate-relief-seats.html
https://www.cyclistshub.com/best-bike-saddles-for-prostate/
The ones without the nose do not suit me. I think the reason they are not more successful might be that bike riders (like me) move around on the saddle to vary the pressure on different parts of the pelvic region, as well as lifting on and off it by standing on the pedals sometimes. By eliminating all the possible points of contact but one, the noseless seats (and especially the ones with a slit down the middle?!) force one to spend all the time sitting on exactly the same points at exactly one angle. This is NOT GOOD ;-).
I've tried a variety of seats since my surgery, as well as with and without various levels of padded shorts (including a top of the line pearl izumi pair). The only thing I haven't yet (dared to) try is my favorite seat before the surgery, a very long narrow, slightly cutout specialized road seat. I may try that too one of these days.
So far, the most important thing is less time in the saddle, whether by stopping, by standing on the pedals, or gripping the seat with my thighs while in a modified drop position (on flat bars.) No matter what, I can't go as long as I once did, although others have pointed out that most people my age can't go as long as I now consider a hardship....
A year plus after surgery, I can do about 1 hour, maybe stretched to 1.5 with my various alleviation strategies. My urologist says 5-7% of RALP survivors have ongoing pelvic pain. I hope I'm part of the 93-95%.