Cool idea but not practical especially if you value fine color correction. An accomplished color printer will oftentimes tweak the balance a 1/4 cc or even less. Once moved, attempting to reset the dials will leave you with a ever so slightly different color pack. This is only really an issue if the printer is trying to achieve consistent color throughout a group of images.
You're much better off dodging with cc filters. If you reduce the exposure then simply burn it back in with a filter over a burn card.