A Little ASM/Hex Help Needed~

I'm slowly beginning work on my hack again. One of the features I like to do in hacks is to use a "Class" system of sorts, and one of my characters is going to be a Bard. Now, I know this requires some in-depth editing of the game's coding, but one ability I would like to give him is an ability like Edward's Hide command from FF4. I figure the best skill to try and overwrite with this ability would be Morph, because I can use Morph to make him hide off screen and then change Revert to bring the Bard back on the screen in battles.

I saw that Zeemis had planned to this in his (now cancelled) FF4 remake hack, but I wasn't sure if he had figured it out or if anyone else had. If anyone does have any knowledge on how to start getting this done, would they be willing to possibly help me accomplish this?