[Egil]

> Graft (80% Light ATK + 100% WPN ATK for healing, at rank 1)
> Mediate (200% Scaled SKI for healing, at rank 1)
> "promote character diversity"

This sounds like 'Let me have one of the most useful skills from x class w/o having to use x class!', which encourages powergaming and not character diversity. I would personally enjoy something more like:

Knight's armor - Protect
Duelist's Chestguard - Riposte
Thief's Poncho - Pocket Sand
Caster's Cape - Blink
Tamer's Regalia - Cracked Mirror (The only skill compatable with other classes)
Farmer's Shirt - Heaven Kick
Healer's Shroud - Rescue
Sniper's Chainmail - Entangle Trap (Again, the only compatable skill with other classes)

This would give value to otherwise arguably sub-par armor without messing with the class dynamic, which better accomplishes your goal with this topic. Having all of them at max rank seems fine to me, too.