When we got Max, we got a crate that had a panel that you inserted to section off the crate, and we were told to make it so that he only had enough room to turn around and lay down. He had an accident in it the first night, but hasn't had another one since. We put a little blanket in the space we gave him as well as one of his toys that he now actually uses as a pillow
I would give it a shot and just see how it goes. Maybe once he realizes that he has to sleep in the area that he just peed in he'll get the point!
Good luck!