The New FFIV

I know the Palom Porum thing was pretty much driving you insane in its difficulty what if you made a temporary compromise? Have a few events in which both Palom and Porum have to be in the party (being able to not be in the party during those times) and one or the other learns one of the Twin Cast spells, so that the extreme spells are split between the two but impossible to obtain without both in the party at a particular time?

Sorry if you have already considered this, just trying to think of a compromise until you can figure out how to do twin cast.