You could still use a rewrite of the actual Craft-charms.
Burn everything there is to the ground first, of course. It'd probably be best to take inspiration from 2E craft charms. You'll want something that reduces the need for tools, makes crafting faster and so on. So, um Craftsman Needs no Tools, Crack-Mending Technique, maybe Chaos-Resistance Pattern? Throw in some dice-tricks if you want to, and give the charms upgrades that make them work on Artifacts, and you're done. 10 charms or so, and there you go with a solid craft-system.
Well, and a Charm that allows you to easily learn other Crafts would be great too. Crib it off Harmonious Academic Methodology maybe. Actually, let's just make Craft one Ability, with "Craft-specialities" that work like Lore-specialities. And then a charm that simply grants you more Craft-specialties quickly and for free.
I'm sure you could throw in some more interesting effects as well. It's not like a craftsman can't pull some interesting tricks.