Restrict Espers by Character

I take the rom that has TWUE on it. Throw it in subtraction code. Change the extension to .asm.

Now take that .asm file to xkas (xkas "filename".asm rom.smc.)  Find Bank $C3, $03F091. Cut it. Now move it to say, $03FEEE. Would that be enough space? What would you recommend?

You just need to change the org $C3F091 instruction to newly vacant space before using xkas. If $C3FEEE is a bunch of FF up to $C3FFFF then you can use this. I don't know how much free space is needed for the hack, so try the lowest offset possible.