Loose scrotum / low balls / 3D printing / Strap

Hello. My girlfriend (now wife of many years) had a lot of fun with chastity decades ago. Now I finally got a 3D printer so I thought I'd dip my genitals into the game again.

What I'm finding is that (now that I'm old, I guess) my balls are really loose and low, so the devices fall along way away from my body, well beyond the length of my flacid shaft, so it's easy to pull out. I tried updating my model so it was "inverted", but it didn't really help.

Am I destined to needing a strap around my waist to hold it in place? From a physics point of view, what would hold a chastity device "up" if the balls are hanging low? (Perhaps a ball ring that is more like a ball stretcher could work, but, that wouldn't be practical for daily wear.)

I have actually had a lot of success with hypnosis lately to keep me from orgasming without permission, a hypnotic chastity. But, being locked up physically is a much better feeling, so I'd like to find a system that works. If I need to buy a waist strap due to my current anatomy, I can do that, but I'm curious if there's another thing to try.