Change addon’s PIN/Password Prompt keyboard layout possible?

Hi folks,

I am not familiar with addons development, so maybe is a dumb question… but just in case …
Is there a way to change the default PIN/password prompt of an addon, from QWERTY keyboard to numeric pad?
What I would like to change is Kinkin’s Universal Parental Control PIN prompt, from keyboard (where kids can see PIN) to TV remote, to get something similar to entering master lock PIN.

Thanks!