I like the IX inspired idea and solution to teaching Blue Magic skills (it is both oddly refined and slightly shamanistic) but I think there are a few problems.
Basing if off of a crafting class and then giving it Lancer cross class skills gives it a really limited move pool and no offensive stat growth. Yes, I know with Blue Magic they can have a lot of skills they CAN learn but starting off would be a nightmare, plus this is kind of edging into one of the problems that XI had, where you had to get scrolls to learn new spells, which usually meant either paying a lot at the market board or .
I would suggest creating a class for it, giving them either a skill that lets them eat the foe (like Eat, Devour, or even something that absorbs like Lancet) or a skill that increases the drop rate of the item(s) they need for their special recipes, and some non-Blue Magic skills. I would also like to suggest that giant forks be there main weapon because they are awesome and then they can use shields. >w>