Here's another idea I'd rather see then enchant protection potions. (because those remove all risks from enchanting).
What about craftable (with hard to obtain materials) magic powder that like dramaticly improves the enchant % even on high rank enchants. like 70% succes rate at 5 even.
This seems to be an interesting idea but would make ancient powders useless if it's easier to get than ancient powder. And we know that ancient powders are extremely rare already.
Enchant protection potions would be rare and justify the use of good powder like ancient powder to avoid failing and having to use another potion but not destroying the item which is the worse that can happen.
Out of the options, I'm for the addition of the potion and for both using multiple craft skills and rare ingredients (so two poll options) but not completely impossible to make like one per year.
One ingredient from peaca int, ok but not as reward chest, more like a drop from mobs. There's already good stuff coming from reward chest and it would be a shame to lose a chance from one of the current reward to find a mere ingredient. A simple ingredient would be, in my opinion, too rare if it came from the reward chest (it's not the final potion, remember).