Dog house insulation....

[Snowtractor]

Asbestos in powdered form is only harmful if inhailed. It is still used alot but processed differently or with added handling instructions and cautions.
However, I believe you can still get asbestos fire blankets that would do the trick, or the fire blanket replacement for it. ALso they make a stud welder attachment that can spot weld a stud, or spike to metal just as slick as s@#T. Then if you use the spike you pierce the material and use a metal push on clip to retain it. They used to use that kind of fastener in heating ducts to hold the insulation in place internally. I imagine they still do. So hit a fire prevention supply store and a sheetmetal shop that does duct work. Hope this helps
Sean