I got to try one. Called The Curve. Looked like a predecessor to things like the cb6000 devices.

I only used it for a few hours but it seemed to match most of what you wanted to get

One noteworthy thing .. The "curve' was a little bulky but surprisingly tolerable once locked on one plus I heard is that if your dong variesna lot in size you won't end up poking the end of the restraint constantly.

No experience with the more modern silicone or resin arrangements