Jonas Magic chastity flute, wonderful ๐ As Ines said, chastity belts can spread among girlfriends who are true believers, and partners who are willing and able to support that lifestyle are rare, at least in their age group. So here, in a white uniform, on a white horse, comes your friendly old pervert ( if I may misquote @MissBlossom ๐) to rescue.
Also, I am admin of a female chastity forum on reddit. The (adult) english speaking female chastity community is not huge, and before you open up to somebody, you will look for common friends and track his history. Keyholding, of course, is even more about trust, and without an established reputation, no sane person will offer you their keys.