Well Bruce's powers in this scenario would be derived from Clark's other great weakness, Magic!
Add that to the fact that I bet Bruce has studied Clark's physiology to the point he knows it probably better than anyone and I see him pulling Billy's call down the thunder trick but with the best possible submission hold for Clark's body.
And thats not even mentioning all the over a hundred martial arts Bruce knows being thrown at Clark at speed and strenght equal to his own.