I was able to get away with a much simpler method:
Surly rim strip removed.
A durable reflective tape over the drilled holes which looks cool and provides protection equivalent to the rim strip.
1 layer of extra wide gorilla tape very carefully applied so that it contours with the bead on the rim
Extra helping of stans
That's it, and it's been holding fine for winter pressures (~4psi). I am using the old (narrow by modern standards) large marge rims so which might have made life easier, and a standard Larry. A previous attempt where the tire was making direct contact with the rim failed to seal, but with a layer of gorilla tape between the tire and the rim it's been holding solid.