Powerclean is a great lift, but I don’t see it ever happening. Too complicated of a lift to spend time on perfecting for an event where you have a few months to train for many. Easier to pull or strain something going for a maxout by trying to impress scouts in a lift where they’ll compensate by using inproper motor patters. Pro Olympic lifters spend all of thier career perfecting the lift, and still get injuries and strains when attempting maxouts.
With all of their resources, I’m sure the NFL could afford more research into a lift or event that shows upper body force production, while mitigating the risk of injury.