The given is he's not wanted at the school he signed. Convincing the coach he belongs is a long shot with consequences (transferring issues) if he fails to do so.
I would sit down with the travel coaches for advice. They may be able to make some calls on his behalf. He may have to red shirt for a year due to lack of roster space. Or maybe he plays JuCo for a year with a D1 verbal for the following year.
Good luck.