Here’s my two cents:
I used to do something with my construction guys, that I might call a “ride-along” for inspectors. My help usually worked independently, and every so often I’d find a reason for two guys to work together for a day or two, and casually talk with them about the other. Generally, it improved the environment. I’d learn a little more about the guys, they’d get to know each other, and only once did I let someone go, as a result of my discoveries. People say and do things with their peers that they wouldn’t with their boss.
Specific to inspectors: perhaps send out a pair from time to time, one inspecting, one observing at site, with commentary off site. Both stand to learn something new, and you may learn some interesting things about your people, service, and system. You’d see peer reviews, quality assurance, personal development, and procedural checks.
In any case, I used it keep my house in order. Hopefully, my explanation wasn’t too convoluted.