The F22 VTEC one can be modified to work. It doesn't take long, and I hear that it works fine, but it requires opening a few port holes up significantly.
If you are industrious you can buy .125" thick sheet Teflon from
http://www.mcmaster.com or
http://www.usplastic.com and make one yourself. The material is expensive, though, and it is time-consuming to make. I've one-offed a few for race motors but I would charge a minimum of $100 to make one (it's that much of a PITA).
Hondata won't own up to me what material they use, but Teflon is the only thing that comes close in terms of heat resistance (most materials won't hold up to head temps) and suface sealing.