I have always thought there was a lot of merit to pitchers having the same catcher each outing, not only for the pitcher's sake, but for the catcher as well.
The drawback of that is what happens in case of injury to one of the catchers, as you mentioned. Having that familiarity with Vazquez would certainly help, but I don't know that I'd want to disrupt Sale in the middle of a fairly tight pennant race. So for the immediate future, I would say no.
Can they do that in a bullpen session or something?