Funny you mentioned this. I've been looking for a version of this http://www.snewsnet.com/cgi-bin/snews/03062.html that can handle direct flame/heat (some type of metal?).

I haven't seen one in person, so not familar with how it works (how is the waterproofing done, now much flex the plastic goes through, etc).

Its an idea... even if all you can do is get a metal version that gives you a frame, then put in some tin foil to give it its 'waterproofness'.

Kris