The solution is obvious- - - - -unbolt the pressure plate from the flywheel and move it sideways enough to clear the socket. It won't come off all the way, but it will certainly slip far enough to the side to give the socket enough clerarance to be removed from the bolt head. Next time, use a box end wrench, not a socket. That's how we did it when the trucks were new, and it worked just fine!
Jerry