I would not worry about that. Locking the rear would not be the end of the world. It would understeer on corners, and unless on slick roads it is more of an inconvenience than a hazard.
Locking the front would be hazardous, but not likely if set up right.
I for one would like to be able to use my lockers at my choosing, with the only safety being the sometimes adequate one between my ears.
I like to wheel in 2 wheel drive, and I like to lock the rear and drift on snow, ice, gravel, etc.
You guys know me, I do shit different, and sometimes it works, sometimes it don't, but I'm usually entertaining.
The answer to the concern, for me, is to wire it similar to an ARB air locker. The standard way to wire it is so the rear can lock anytime, and the front is in series with the rear and can only lock after the rear is locked.
Hitting one switch by mistake is possible, but hitting two is not likely