Pedro, your glass pannel could be mounted with retro springs (one at each corner). Place a microswitch in between that validate the choise. The microswitch could be activated only with a finger pressure that you can control using springs that will require the correct compromise between security and usability.
Another way could be to have a separate switch that should be pressed after that the disabled has found the requested command. A vocal staff could be activated after the selection has been made to tell which command has been chosen and to request the pressing of the abilitation command.
Al.
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