if it's within the rules, go ahead.
But - here's my reaction --
let's say you're Fleck or Harbaugh. you're watching practice and Brosmer is lighting it up - looks WAY better than the other Gopher QB's. but you can't use him in the game.
on the one hand, it would get you excited about next year. but at the same time, it would be really frustrating to watch the game knowing that a much better QB is literally right there - but he can't play in the bowl.
same thing from the players' perspective. "d*mn. sure wish we could use this guy in the game...."