Email 'mojorising' as he is on tour right now. Obviously, I can't speak for him (or his relative who's home mojo is using as his base) but it would be worth a try.
Yuma is about half way, literally, between Phoenix and San Diego, and there is a Greyhound bus that goes either direction, as well as shuttle vans from Yuma to Phoenix airport (worse case scenario, if you "had" to leave it here). I have other friends in the Phoenix area, too, which might work out for you, again, if Phoenix seems like the place to pick up your journey next year. PM 'mojorising' at any rate.