How about doubling up on one side of the glass with the setting tape? The setting tape you found is what was used originally.
BTW, the service manual talks about using a little SAE 10 engine oil on the metal channel when installing. That may be enough to get the tape to go around the bends as it should. This project is in my future as well. It also recommends using a little gasoline to soften up the tape when removing the old glass. I did use that trick, but used something a bit less volatile than gasoline.
Doubling up with "Any" of the materials would make it way too tight or well beyond a proper fit. I have did the Math for all the tapes or material for setting the window/vent glass "the math doesn't" ad up. The old setting material that was in the channel is of a plastic type stuff (or this is what was in it) that is Molded in a stiff U shape, that U shape stuff isn't available anywhere. Mine is/was unusable.
