I don't think that would be showing up the other team at all. With interleague play and the World Series, a team is better off knowing if a pitcher can hit or not, and the only way to know that for sure is to get them to the plate in a real game and see what happens. Letting him try it out during a blowout win or loss would probably go over just fine and personally I don't think that would be showing up the other team at all.
Yes doctor, I am sick.
Sick of those who are spineless.
Sick of those who feel self-entitled.
Sick of those who are hypocrites.
Yes doctor, an army is forming.
Yes doctor, there will be a war.
Yes doctor, there will be blood.....