Get rid of the tomestone tokens, let the price be tomestone.

Question is, is it just flair or is it not possible(dev/code) to exchange tomestones and another item from the inventory for a weapon, because one is an item and the other a currency.
All shops ingame in ffxiv are either item for item, multiple individual item for item or currency for item as far as I know of.
I don't know if it will rank high enough on their "quality of life" changes list, as they need to code something new for it.