The other one which I really don't like, she can go and say that he had been abusing, insulting and beating her. They will give her the visa and will kick him out of the country or he will come back to her on his knees. Which won't be a good thing to do to her husband.
He should put her on the application she is the mother of his kids at the end. And then divorce her once she gets the visa if they still want to do so.