hmm interesting you guys mention this. Im also looking into solutions myself, but for tubular manifold and larger drop in turbo for my evo x (something thats been tested in the evo community but not super popular bc of price)
theres a company called 'Advanced Thermal Covers' out in Irvine, CA who makes more elaborate inconel shields.
It is a bit pricier than heat wraps to be sure, but it gives me some piece of mind that it might be less likely to catch on fire.
I am guessing maybe its closer to 500 to wrap a manifold not including shipping, but yeah I think they will also wrap downpipes and turbo bits as well.
I am sure there may be more local alternatives in your area.
I am looking to use them to wrap my Morris Fab tubular manifold and maybe mitsubishi MHI-18k turbo
Just found out about them a my mitsubishi mechanic Road Race Engineering where they showed my a wrapped manifold, wish I took pics of it.
https://atpwrap.com/alloy-racing-covers/