FWIW: Personally, I find it odd that in warmer states that all the breakers are outside for any random yahoo to come by and tinker with, and, yet, it never seems to happen. (Yes, I know, now required everywhere with NEC 230.85 for residential electrical disconnects.) So, perhaps your, and my, concerns are overblown? The same kid could flip your main breaker, but hasn't done that either so far. Right?
You can always put a draconian warning label over it, with a dummy, or not so dummy security camera...
All the best,
BG