OR, do you un-bolt/re-bolt the caliper on each wheel change to center the caliper on the rotor?
I have a disc frame with 4 different wheelsets, of differing hub brands. I found that hubs can have anywhere from 12-14mm of spacing from the end cap to the rotor surface. But definitely each and every hub comes in a different spacing.

Me, I've become adept at dis-assembling the axles and shimming them so that the rotors on the different hubs all fit equally in my brake calipers. Just so I don't have to re-bolt the caliper every wheel change.
But maybe you don't go to that extent. So how do you deal with this very nagging issue?