I'd be doing that if we weren't at the limit of how many dogs we can own. Their great for protecting livestock and alerting owners of threats like other dogs. My dog would be great at it if he wasn't bird aggressive.)
Sorry for your loss. And definitely have him pay the cost to get new birds of your breeds. Plus repair costs. Also a fence to prevent it another time. These birds aren't cheap after all. He should pay in full (given that it is not way over priced.)