Blocks arrived.
Here are the results. Not perfect, but I can definitely work with this.
Note the line that looks like a crack is the witness mark from squeezing the blocks onto the chrome surface.
I can work with this. It'll take a tiny cheat of filler to look right, but it'll save the tube, the chrome, and everything else; I'm definitely not willing to go that far down the rabbit hole with this one when the frame is straight and a bit of filler will do.
-Kurt