Truly an amazing DIY task and very creative. I was perusing the Colorbond website for leather dyeing and they actually have a video about using their product to restore a steering wheel & associated trim pieces to "factory new" appearance. I couldn't help but think about owners with the two-tone Dark Slate Gray & Cool Vanilla interiors that have the "white" steering wheel. Seems like using the Dark Slate Gray Colorbond product to dye that steering wheel (including airbag) would be an interesting DIY project. (Note: Masking the airbag could be a major DIY project in & by itself.) During 2008 model release, Chrysler actually delivered the two-tone Dark Gray/Vanilla interiors with a Dark Gray steering wheel. Actually looked pretty good that way.

Once again, a very good restoration job! Congratulations!