I'm a chastity enthusiast, but my wife isn't.

She indulges me a little, here and there, but the whole concept of orgasm denial escapes her. One thing she DOES love is the "ownership" it gives her.
She would love it if I could wear something when I travel (often by air) that would signify her ownership of my genitals, but neither one of us wants me to wear a chastity cage when traveling--too many problems with comfort, sanitation, device security, and airport security. Plus, I can make myself cum inside a cage by using a vibrator.
Anyway, I'm hoping someone can help me: I'm looking for something I can lock onto myself (around the scrotum or penis or both) that I could have printed or engraved with: "Property of Angela" (for example)
It would have to be made of a material that can pass through metal detectors, and ideally it would be removable but lockable. "Permanent" (even if breakable) would be acceptable also. It doesn't need to prevent masturbation or orgasm, but it does need to be something that I can't remove without the "key" or at least without her knowledge. I'm willing to get a piercing (I've done my frenum before), but I'd prefer not to.
Any ideas come to mind?

Thank you for your help!!