Are you currently holding the gun? If not, take off the gloves and then pick up the gun.
> if I lose the ring or it comes off
Same thing that happens if you lose your wallet or car keys. You go find it immediately or get a replacement quickly.
> girlfriend needs to grab my handgun
Hopefully they can make smart guns that can have two authorized users.
> so many ways for this to fail
Regular handguns can also fail - anyone can pick them up and shoot anyone else. Some people consider that a bug, not a feature.