Very Small Testicles

Hello. I’m a man of 43 who has been applying Tostran gel (2% testosterone) for about a year and a half now. A doctor in Sweden prescribed it to me, and it was definitely something my body required. Doctors there are quite particular when they prescribe this medication. It has significantly boosted my libido, but one side effect is that my testicles have shrunk considerably. I’ve met a woman who really enjoys male chastity, so I told her I’d like to give it a go. Does anyone know of any devices that would suit me? Greetings from snowy Sweden.