Disable shortcut keys for Universal Access

At our school we have a bit of an issue with students using keyboard shortcuts to set the Universal Access options (usually to Black on White, but also Zoom and VoiceOver), which freaks out the next student using the computer. I'd like to disable the shortcut keys for those settings. Are there ARD Unix commands that would do it?

Hello Francois,
Thank you for your fast reply!
I tried your recommendation, but got the following result:
When I have a label of "& OK" with the blank symbol as ALT-255, the Button in the Alert Box still has the focus. It seems as if there now is a blank in front of the OK (which is underlined). This does not really solve my issue, because the Button still has the focus and that should not be. The best solution for the user would be if he only could accept the message with a mouse klick.
Is there an other suggestion?
Thank you so much!

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