I think it's fine now how it is? It's really not that much effort to visit the Currency page (which they all have a "turn in currencies here" link of some sort listed) or the top of the shop you're already using to turn things in (where they're listed in the blurb at the top). I feel like it's just as many steps as going into your inventory, clicking the item, clicking the link to add to inventory, etc.

(this is the correct location)

I honestly wouldn't mind this being added. I think it adds consistency for currencies and makes it obvious what the item does, but I wouldn't be upset if it doesn't get added