I agree with Fro, there is zero reason to be training emergency catchers throughout the minors, its a one in a million chance. Let's put it this way, you would be much better served teaching your position players how to pitch then to worry about having a glut of emergency catchers in the org, seeing how position players pitching occurs about 20x more then the whole 3rd catcher being "needed" Anyone can go behind the plate for a few innings and catch a few balls, yeah, its probably going to be ugly but it is what it is.