If he will not come, ask him for contact info for a priest that will come.
I must say yours is the first I've ever heard that a priest will not come - SSPX or otherwise. Perhaps you may need to go pick him up and bring him back? - which is rare but possibly understandable. But I've never, since this crisis began, have I ever heard of any priest that just flat out refuses to come.
I live an hour from an sspx chapel. Priest refused to come, even if I drove him.
Thanks for the idea to ask for contact info for a priest that will come.