Wish Performance "Lock" Mode

Looking for a way to lock out all controls on the unit other than the 3 footswitches (and external controllers) so that nothing can be accidentally switched or pressed, and potentially change settings or sounds, during live performance. It can be as simple as "hold down the enter button for 5 seconds on a particular screen" to lock/unlock the unit.
 
I’d like to see a way to lock all controls except for the foot switches. Maybe hold a button for 5 seconds to lock and unlock. I occasionally play gigs where the stage is floor-level and sometimes people can creep up close to my FM3.
 
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