Chastity and orgasm denial discussion

I’ve been curious about how others handle devices that rely on pain to prevent erections. If you stay soft, you don’t climax. In that way, they outperform many other options. However, my time with the POI used in a CB-2000 showed me that while effective, the pressure points were… well.. quite sharp. I worried about puncturing my shaft fairly soon. Right now, I’m experimenting with a concept for a device resembling a locking harness for a buttplug, but featuring teeth on the cockring. It’s an intriguing idea because it keeps the penis exposed (great for hygiene) while still preventing erection. A solid concept, though getting it right is tricky given my home workshop tools and materials. Does anyone else have experience with sharp pressure points?