You could try exhaust header wrap, but I'm not sure it would work all that well since it's designed to stop radiant heat and not conductive heat transfer.Your best bet is to try to prot...
https://youtu.be/_2ykkPTRbQkOK, well here it is. Its's just a proof of concept so it's still pretty sloppy but it should give the gist of what I'm working at.