We wouldn't win the appeal. You'd have to prove that the rules were implemented incorrectly and because it's borderline, they'd side with the ref. Equally they wouldn't be imposing a 3 game ban now if the ref had only booked him.
Not saying that I agree with the law, but by the letter of the law it seemed like a red to me. Keane's head seemed to get knocked back so I can't see us successfully arguing that the force was "negligible".
I love Gana but it was a stupid and deeply unprofessional thing to do.