If they weren't so expensive, I would try one of the other belts they have. It looks like they cinch down on your package when you pull the cord down. I imagine it works like one of those Chinese finger traps. Obviously the thing can be cut off, but for a sissy (TG) looking for a discrete belt, it might be fun to have one. If it were voluntary chastity, they most likely wouldn't cut the belt off.
They really don't have much on the market for TGs into chastity. Belts are high dollar and clunky, while tube devices prevent a nice smooth line. The ones on that site are actually pretty innovative. They're just all extremely high for what they are.
I personally wouldn't be able to use the one on the bottom of the page. Even if I still had a foreskin... the description sounds incredibly painful. I'd get pierced before locking a hose clamp around my foreskin.