I like that idea - (I still like being in enhanced cleric stance, but OK OK OK!!) - I would rather have the potency of each of those ideas be reduced, though, and have Geomancy STILL be a stance, and you can build stacks of Elements. Like Stone/StoneII/Earth gives you 1 stack of Earth and you can get up to 3, Aero/Aero2/Tornado = wind stacks, Flood gives you two and Aqua gives you one water stack:

In Earth: Each stack recovers 10% of damage done into MP for you, and 5% of damage done into MP for others in your circle (circle is something like 3-4y that stays around you as you move)
In Water: Each stack returns to you 10% of the MP used to cast any spell, and 5% for others in your circle, but 7% if the spell aids an ally.
In Wind: Provides a weak "Mana Regen" circle for you (uhh 4%/tick/stack?), and a weaker one for your allies (2% a tick)

So go stand by the SMN/BLM in Earth, Healers for Water, and everyone for Wind.

Adds an even more interesting support element!

If we keep getting better ideas I'll re-write the OP.