I think even further. To wear a chastity belt is, sometimes hard enough.
I think that to be permanently remembering the girl "eh, your key is here, just break a plastic", is even cruel.
Our mind should stay calm, and for that, I think that not only the key have to deseaper of our life, but also the belt should be the more safe possible.
Even if is absolutely impossible not fight at all with our belts, the anxiety of fight to try to cheat must be erased with a totally safe belt, for that I always defend wearing thigh bands as important element.
I hope I could explain myself rightly.