This has officially gone from digi-concept to real project.
I used a Bendy Prime head in the digibash, but I have no extra Bendy heads and I have used/am using the heads from other Prime toys for my other Optimus KB's, so I've decided to build one.
Behold! The front half of Cybertron Downshift's head (left over from my c-Shockwave) and the back half of Universe Ransack's (left from my "Optimus Hoist"), along with judicious applications of epoxy putty = Optimus Prime.
So far, I've got putty in place for a remolded faceplate, as well as a new crest and smoothing out the crest at the back of Ransack's head.
I'm still contemplating what to do for Op's "ears".. so far, my only idea is to simply sculpt them out of more putty.
I'm trading some stuff to my buddy for his damaged Demolishor (the left elbow snapped, but he sent me a pic of it and I'm sure I can fix it), so when he sends it to me, this project can really get started.