Nick, that was exactly what I was planning.
Great minds, think alike.
I want to grab some plastic canvas to play with. My main question: how heat-formable is it?
My thought is this:
1) Pull off the yellow inserts.
2) Cover the sole in plastic wrap*
3) Use Apoxy Sculpt to create the new insert shape (Extending out)
4) Once the Apoxy Sculpt is hardened, pull the sculpt away from the plastic wrap, heat the canvas and shape the plastic over the sculpt, gluing it down as you go.
5) Seal, smooth, mold, and cast a [hopefully] perfect new clear sole!
That's why I want to see just what I can do with this stuff. If you have any of it, please feel free to experiment and report back, I'm not sure when I'm going to be able to go on a supply run next.
-Nick
*That's me desperately trying not to have to make a waste cast to sculpt onto, but I could also just mold the original shape, sculpt over it, etc.