dartsndeacs
THE quintessential dwarf
Those sound like more quick fixes, ie put duck tape on it and let's get through the day fix. Longterm drills would involve fixing your plane coming through the ball. As a longtime recovering hooker, what fixed me was eliminating my tendency to swing inside out, ie hook if you flip it or push if you hold it open. Practice having your iron ending up pointing directly at the target on small chip shots with the toe up, and finishing with your chest facing towards the target. As hard as it is to do this, your plane with actually be coming in much for inside on the way down than before, and you will not hook it as much. Your finish will naturally release the club and you won't flip it as easily.
He suggested I get a Mag-Lite and swing with it, and the light should be pointing at the target on the backswing, on the way down, and through the finish. He said I manage to go inside and outside the plane about 4 times during my swing.