>Neutral conjies could call "greater" elementals which would
>subsequently protect the neutral conjurer with a shield of
>that element and perhaps cast invoker-ish spells of that
>element as well?

I believe the underlying problem you are trying to solve is a way to make neutral conjurers more viable, or have a niche for specialization. Not sure what I think of this particular idea, but I think I know where you're trying to take it.