The smaller cages, for me, are too big. I can't use the ones that have urethral inserts due to infection problems. My Lady and Mistress demands my chastity and intends to control any, authorized, orgasms. Thus, during the day I must always be in sight of her; if and when I need a toilet, I have to keep the door open, undress and be in sight. When I have to clean and wash, I have to warn to be checked. At night, my hands are tied behind my back with soft handcuffs. The cage, for me, would be an element of freedom. I can touch myself once a month for a limited time and always under control. Most of the time I can't reach an orgasm. I am seventy years old and I have been living this situation for twenty years.
Have you tried small ones like these?
https://www.amazon.com/TERNENCE-Chastity-Device-Comfortable-Virginity/dp/B07FQR4T3P/
https://www.amazon.com/FYJENNICC-Chastity-Device-Briefs-Underwear/dp/B08HXW46LQ/
Or really small ones like this?
https://www.amazon.com/VCOOTS-Stainless-Accessories-Training-Optional/dp/B0B1CRL6LR/