What I can add is that there are I/R instructors in Ohio. Most people outside of DFP have no idea what I/R means. It is a term that was made up on that website by the username Boardmember. I am only comfortably familiar with a few pitching coaches and they teach it without calling it that. Bill Hillhouse, the Leffews, Jeanette Howard, Ed Beavers, all put out pitchers who throw with internal rotation. I cannot speak for the instructors I am not familiar with.
As far as hitting instructors, we have Tim Duncan, Howard Carrier, Crystl Bustos, Micaela Minner, the McCoys, and many others who teach a high level swing. Those are the only ones I am personally familiar with.