There are so many moves to choose from in basketball. Everyone seems to want to learn/teach a million different ones. It's important to develop a small package of moves/counters to go to as a bigman or bigman coach.
One move that seemed to have gone away for some reason is the one legged running hook. A long time ago a Hall of Fame Center named Kareem Abdul-Jabbar perfected a one legged running hook called "the skyhook". It was an unstoppable move by a long armed 7'2 center that could elevate and create separation with his body fending off defenders while bringing the ball up and behind his head to elevate a soft shot and extend over his man.
The shot was one that was in every elite big man's package until it started to go away for some reason. Most big men will go to a two footed jump hook to replace the running/sky hook. Now a few big men and wing players use the move in today's game. Tim Duncan, Pau Gasol, Marc Gasol, LeBron James, and LaMarcus Aldridge are all big men in today's game that have perfected the move.
Just like anything else the shot will be more comfortable the more reps a player performs. They can start with jus a no dribble one long step skyhook with their strong hand. Get them used to the last step and shooting the ball with it. I would say 100-150 reps before they start to come around. Like a jumpsuit make sure all 5 fingers on the release are facing the rim, and make sure thy have a soft high arc so the ball can hit the rim softly and give some bounces.
Here are some video's breaking down the move.
Good luck with your teaching and let me know how it goes.