Espers: 1 set of spells

I was curious as to what the game play would be like if espers made you forget the spells you've previously learned from other espers.  So your magic list would be only what the equipped esper teaches (and natural magic for Celes and Terra).

To get started I would need to create a subroutine where: if an esper is equipped, have it unLearn all the spells you know.  After that, have it add the natural magic skills back in.  I'm having trouble finding out exactly where "equip an esper" is because Section C35 looks like a jumbled mess.  This is way more advanced than what I've done previously, so it would be a cool project to get learning.

Maybe we could even make it so you don't lose knowledge of learned spells entirely and keep a % learned so switching back to an old esper is easier to get your spells back.