stumbled across this puzzle lock as part of Amazon Prime Day deal today. https://www.amazon.com/Brass-Square-Trick-Puzzle-Padlock/dp/B01N26IV4W It is not really practical to put on your device, but could be incorporated into a special lock box. And then your key holder can make you earn the three keys in stages. Here’s a link to a video of the lock being opened.
This would be a great wrinkle in a cuckolding chastity scenario. Especially if the Keyholder has more than 1 Bull. The cuckold husband would have to secure a key from each Bull before being able to access the key to the cage. This sounds like the basis for an interesting fiction story, too!
I imagine that fixed to a chastity device somehow and then trying to walk through security... metal detector... pat down... search... look of shock on the TSA agent's face, who would for years tell the story of the guy with the 3 pound padlock locked to his junk