I wonder if it would be feasible to implement a keypad scrambler on/off button/key for the lock screen?
E.g. by initially placing it in the bottom row, next to the zero and make every key (including the scrambler on/off button) shift position randomly every time a key is pressed. This will also allow the scrambler key to act as a “make no input”-key in order to mask the actual number of digits/characters in key.
Will it sail?