Well, there's a pretty big tradition of spirits giving parts of themselves into the creation of an artifact. Not going to be easy, by any means, but perhaps you can ask him about it.
Well, using part of the neverborn itself would certainly be an exotic component. Probably fit for an N/A artifact, all by itself(getting the piece, now that's the hard part.).
Also, anyone have a good idea for the name of an Earth Manse? It's supposed to be a hidden cavern, and either a Workshop manse or more likely an Atelier-Manse.