I'd still argue against it at the OW level due to the added expense. The extra travel is going to basically double the cost of the training, if the guy wanted to be trained in sidemount or was already having to travel and spend the night in a hotel then it turns the tables, but the guy lives half an hour from Ginnie, and all of the associated instructors that work there, why complicate a very simple thing. Gainesville area instructors, there's a boat load of them, and I'd recommend Harry just because he's well versed in backmount, and likely more importantly actively training new divers which is something a lot of technical instructors don't do regularly and teaching OW infrequently can actually hurt the new divers because it is a very different teaching style.
