Interesting thought. There is a Tuscan soup called ribollita (reboiled) that is made from leftover minestrone. They add stale bread the second day, which breaks down during reheating and thickens the soup. So the breading from fried chicken would probably work the same way.
I would have extra seasonings on hand, though. I think the liquid you add to make it a soup would dilute the flavor.
The trouble with eating Italian food is that five or six days later you're hungry again. ~ George Miller