But the problem with that is you rely on being hit with the spell in order to change utilize it, when the world revolves so heavily around shadows and complete damage mitigation this would be trifle at best (sorry for sound so harsh) but having a way to Null- the spell and have the Null-spells proc BEFORE any kind of shadows, it would make SCH a much desired job to have in the group. Especially if you can Null-elemental spells (also it stays within the classic FF terminology/spells)

Now, don't get me wrong, I like the idea as it was obviously inspiration towards the null- idea but in terms of putting sch to the top of the line, I just don't think it will happen. People aren't going to leave their shadows down in order to have a chance to get hit with a stone/paralyze/enfeeble to turn it into an enhancement, and then run the risk of getting hit with a nasty -ga spell instead.

The second part of the idea (elemental portion) sounds like something that would sway people to pick a SCH in a party, but I'm just still not convinced the -na thing would work unless it just stopped the enfeeble from happening and processed before shadows did. (as Null-enfeebles have been used in previous FF titles)