FF6 with FF5 job system, NEED HELP

Final Fantasy 6 with the job change system of Final Fantasy 5, but still having all the elements of FF6. This would mean redoing the entire class change system just for 6, to keep all the original characters, items, weapons, music, etc.

This can be done, but it's extremely difficult. The number of sprites needed would be absurd, for each class AND for each character.
Having ~20 playable characters in FF6, and if you consider 20 job classes, at least 400 sprites would be needed. Absurd.

With regards to the class system, you'd have to erase the whole esper and magic system to be able to create a new system that would teach characters abilities based on their class.

Just thinking about the number of sprites turns me away from this X_X