If it were up to me, I'd have Hypercharge cancel the Promotion effect (so as not to make it seem OP). And while BRD and MCH are different, they are still classified as the "support" jobs, so party support was largely what I had in mind with this. While the BRD's passive crit buff is a mainstay of all their songs, it would only be a Rook Promotion effect, and limited to the length/amount of MP. So similar, but not quite as similar. Still, I'm open to any better ideas.