"I asked Thermarest if Platy patches could be used for a temporary field repair of my NeoAir,"
Where are you finding Platy Patches? I have one left, and can't find new ones anywhere. They are no longer on the Platypus web site, either.
Kind of a pain, because I used them all the time. Much nicer to patch a Platy than have to toss it and buy a new one for one little hole. (Okay, nicer for me -- not so nice for Platypus I suppose.)