So there's at least some demand for a key that works like a Yubikey but has a breakable form (that presumably sets off a piezo device that scrambles the key). K

So there's at least some demand for a key that works like a Yubikey but has a breakable form (that presumably sets off a piezo device that scrambles the key). Keep it in your pocket, break it with your hand, or slam your hip into a wall/floor to break. Make sure to take the key out before you sit down! Or, once they exist, just carry a broken key with you for plausible deniability?