I remember allen millyard used fake coal as heatshield material on his viper build which you could use to replace the asbestos
you will have to trawl for the video but this text:
"So, Millyard gathered more information. A bit of research revealed that the high-temp-tolerant material used to make the fake coals that some people put in their gas fireplaces is made of a very similar material to that used in space shuttle tiles. He got hold of some of those fake coals, sliced them up into tiles, and used high-temp silicon adhesive to affix them to the underside of his heat shielding. At one point, he even demonstrates exactly how heat-resistant they are by sticking a tile on his finger and using a blowtorch, as you do. If that doesn’t get the point across, nothing will."
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