If there would be a "The Chronicles of Narnia: A Horse & His Boy, the Musical" who's your idea of a cast?

Gerran howell is a good brittish singer and actor he played vlad in young dracular so if you look him up you will only find pics of him from when he was younger. He is around 18 19 now so you might find a place for him, but i have never read the horse and his boy so maby not.