Does everyone hate the bat on the hips drill? I have and still use that to illustrate that the hips pull the rear foot, not the other way around. I have found it useful with kids who arm swing. (after teaching overhand throw of course)
The "Hitting Videos" thread has a video called "Explosive Rotational Hitting For Beginners thru High School", that has a drill similar to what you describe. I like your description that the hips pull the rear foot. "Coil-Uncoil using The Move" is how I think of the weight shift. Ted Williams described the hip movement as a "spinning action with the head as the axis". The drill you describe seems to follow that description.