Haram Maneuvers To Make Something Halal
He needs not to do this to make her halal. He still can marry her if he doesn’t care about the the divine directives. The both ways he is sinful. However at any state of he repents sincerely he will be forgiven. If he is married to her, he can carry on, according to the Principe, what is done, is done.
He can marry her.