[Ranylyn]

I think I'd actually use Tekagen if this was the case. It's a less drastic cut unless you build will, and the benfit is boosted by will. As such, you can manage all kinds of builds, like one that keeps Tekagen on all the time with low will in order to get some bonus FP regen in exchange for some stats, or heavy burst builds with high will that basically use Tekagen as a battery between all out assaults.

The HP recovery could possibly be a concern, though; doing 1/2 will instead of 2x is a good start, but it may require removing the HP heal if the MP heal is potent.