You give someone a tablet and they are three layers deep and dont know how to get back to main faders because they have no basic concept of how a console works at least the faders on a hard surface never disappear "sort of".
This is the generation that has spent 1/3 to 1/2 of every waking hour since birth on a hand held device of some kind, so maybe you are selling them a little short on pickup speed.
And just for clarity my suggestion to lockup the console was meant for when it's not in use, and to that end don't try to reinvent the wheel just get a lockable road case for it and bolt or otherwise fasten that to a stand/table at the designated mix position.