I might get buried for this. And it's asking if you have a totally SEPARATE skill.
But is it possible to photoshop several of the bad pictures together into one good picture?
I did this all the time when I was doing Wedding and Engagement photography. If you're good at it, no one will ever know. It pretty much became a secret weapon, as long as the photos are in focus there is almost nothing I can't fix in post.
At this point he's probably costing you money because you wanted to use the images for a promotion, right? Let him know that. That's probably your best bet at this point, trying to make it clear that he is the road block in your business right now.
And next time make it clear why and when you want the photos (I need them by Nov 15th because I want to use them in Black Friday advertising, etc). And make sure to get a contract with a delivery date.