If you're aiming to upgrade them all up through into tier 4-5-6 assets I'm afraid you're out of luck. It's easy to miss but just like with the other assets, there's no upgrade from white -> green, you can only get green and higher crafters from profession packs it seems.
The base results from the final tier crafting are worthless though, the only time they might ever be competitive is with the higher quality results (maybe even those are awful, I've not actually seen any of them yet)
During dungeon delves and again an hour or two after the servers come back up, right before finishing daily dungeons each time. Yes it is killing my AD per hour.