Most jobs use aether in some form or another. A good job for someone who's not as aetherical inclined would probably be Machinist. As the box they carry on their hips draws in the aether needed to use their tools. Conjury would be a good one as unlike thaumaturgy it gets most of its aether again from the surrounding environment. As it's unwise to go about casting healing magics while only relying apon one's own aether. I think Red Mage would be fine as one of the NPCs involved in that quest line is aetherical challenged as Arya can still cast spells. Even if it doesn't come as freely as it does for the WoL or X'Ruhn.