Here's a simple idea. Replace the human pusher with a hydraulic press that will apply a horizontal force to the chest of the person being pushed that is of equal magnitude to the human's push. The human's push will go from zero to some maximum over an interval of time. Have the force of the press increase over an identical period of time until it reaches the maximum.
Will the results be the same?
Short answer: no.
Long answer: It is not that you are purposely trying to take the pusher apart, but his own push will take him apart, by magnifying any faults in his own connectivity, if he is not as connected as the human being pushed. The better connected wins. Now if we have an evil pushing machine of doom, that is going to be quite unlikely that it would have severe mechanical faults in its structure, assuming it is made out of some metal of quality better than swiss cheese and adequately secured to the ground with more than chewing gum.