Cool ideas!
As far as ideas how to do the head, here's something I just thought of.
What if the spinning head and head/neck articulation were
combined?
The MEF head piece could have two parts: the helmet "shell" piece, and the faces piece.
Think of a regular head on a ball jointed neck, how it can spin 360º.
And the head sculpt would be sculpted as a single piece with the dial stuck on the top of his head.
Then just have the head sculpt "floating" enough within the helmet shell so that you can tilt the head a little forward and back, and just turn his head and keep going until you reveal each additional face.
Actually, looking at that cardback art again, the 4H could even make the helmet attached to the armor.
Slip the helmet over the head sculpt and then attach the armor in the back like He-Man's.
Just think it would be cool to finally get a MEF with a slightly poseable head.
