I could see some sort of enchanting system being added as a "crafter", that works as a version of materia that stacks with it without taking a slot.....

Also, maybe it requires fish souls to do the enchanting. Just because as a Fisher, I find that nothing hardly requires fish aside from a very small amount of CUL and ALC recipes, so most of what I can catch is completely worthless since I can't even sell it to vendors for the price of the bait used to catch it.....