The New FFIV

Hey, idk if you know it's out there, but I have a patch out there that allows you to switch between Dark Knight and Paladin already, so you can download it from this sight and apply it. If you've already figured this out, then nvm.
My only concern is how you'll get the script to switch between White and Black, because the game registers, for example Terra and Esper Terra, as the same character, and all the transform command does is switch the sprite set and boost her stats, but the command list stays the same.
Maybe you could reroute the command to make it switch between characters (like say trash locke and replace him with Esper terra, but make him unplayable and his command and stats are rerouted to Terra via the transform command, allowing you to have an alternate command list, stats, and if you wanted, spell list from which you learn from.