I like the idea of using lilies during downtime to buff a spell. That's a cool idea. I'm not so certain I love your upgraded spells (for one, I don't think they should be upgraded to instant cast lol), but I see what you're going for. But I think that flat potency increases and new animations/skill names could suffice. That's less interesting, but it's way more realistic.

Not really a fan of Bravery though. I think if WHM is going to get direct offensive buffs like that (that grant a lily on top) they'd have to have their potencies slightly adjusted across the board to compensate. But I guess that's doable.

As for Protect? If you really wanted to reintroduce it, you could probably rework the current PvP version of Protect to allow it to work with a PvE WHM kit. That would be really interesting.