We use a communal computer at work. Certain users constantly add additional keyboard layouts, and forget to disable them when done, which annoys the majority of the computer users. We have warned them numerous times, and have threatened to "permanently" delete the layouts. I wish to make true on my threat. What I need is how to prevent a keyboard layout from appearing on the "Change keyboards..." menu on the Region and Language settings. I don't necessarily wish to permanently delete the layout, I just need to prevent casual users from finding it.