They need to learn there spots. They are good enough to start this. Any other ways of working in this?
I am not sure how good they are but put a plunger upside down in a batting tee so it can hold a bigger ball. Place a basketball or larger ball on it. If they can hit it off the tee X times out of 10 move to a smaller ball, like a volleyball, then 16” softball etc. If they cannot hit the smaller ball move back up a ball size.
You can move the ball around the zones for the players to hit. Like you mentioned a horse or pig type game can be played. For the low pitches you might need to swap out the tee for another ball holding device like a cone.