First of all Frank Warren and Mick Hennessy would sit around a table and that would be the harder to make than the fight itself.
Witter would ripe Amir a new ass hole and then turn out the lights. No promoter in their right mind would put Amir in with someone like Witter. Witter is still a very classy fighter.
style wise Witter isnt a bad matchup for Khan, Witter would be much more of a threat to Hatton than he would be to Khan. think Khan moves down to fight the winner of Angulo-Romanov after Kotelnik though.