Currently craft is a hobby instead of a full on job. Why not make party based content for crafters too. Almost all the items in the game require a few crafters to make them why not build upon that.

First you have to make some changes to how crafting works and how players get items. A players goes up to a NPC and selects an item they are looking for, let's say Harpoon. Then it placed on a wanted list with the amount of gil the player is offering.

Next a crafter goes to the NPC wanted list, selects the item and another windows shows the mats and classes needed to make the item. At this point the crafter can either group up in a party to make the item. Once made it because "useless" item until traded back to the NPC, money is given to each crafter and the player picks up the Harpoon from the NPC.