How about adding options for scroll exchange on an already existing npc?
Some scrolls are very common, like Armor Option Scroll (High) Crit Damage ones..
Maybe add the options to exchange for a better scroll with Core Alchemist in BI, or any other existing npc that's a Core Alchemist.
An example would be to exchange like 100 armor crit dmg, / 100 crit dmg weapon or something else, and various other scrolls, for maybe an hp steal for highest, which in my opinion is hard to get.
Maybe even the possibility to exchange for a crit rate scroll, or max crit rate.
Or just have the possibility to exchange between Weapon (High) Crit dmg to Armor (High) Crit dmg in a 1:1 ratio. If you dont happen to have the scroll you need(Armor), but have the other counterpart of it (weapon), if you end up needing for armor, you can always exchange it.

Is this possible?