I Need A Steel Cage To Alarm On Touch. Any Capacitive Switch Alarm Experience?

Hope everyone is having a good day! I have a client that has a 6'x6'x3' powder coated steel "jail cell" that he uses as a display case. You can fit an arm between the bars and potentially grab something inside of it, but in so doing you will almost definitely touch one of the bars. I figure I should be able to run some kind of capacitance switch to trigger the panel, but thought I would see if anybody here has tried something similar first. My fallback is to use an access control style motion REX to create a "wall" right in front of the cage. Any ideas? Thanks in advance for the help!

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