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If you're using an IR gun you can tape the glass with aluminium duct tape, it's won't protect it if you stop concentrating but it helps to reflect the IR and stops the glass heating up. Another method I've used is aluminium foil wrapped around hardboard as a shield.
There's an element of risk involved in any process where you have heat and glass. It's always a bit more jeopardy if the glass is a couple of hundred years old and new glass would stand out. I keep all the old glass I remove from windows for this reason, sometimes I can cut a new piece.
Airhead
I’ll look into superdec then! What prep did people do? I’d like to leave the door in place if possible (it’s massive) and I have a knockoff speed heater and a carbide scraper. There is a bit of beading around glass panes but it’s not very fancy.