I would suggest that prolonged temps of over 100 to be unhealthy for the snake no burns no damage just no digestion. I my research has concluded that prolonged temps of over high 90s can exhibit digestion. So why don't you use the max generally accepted temp for royals in your test 94ºF

My fast test I just did is very simple, tub lid and my hand under it. I used a traceable platinum PRT meter with a fast response time. I measured in 3 min the plastic was 92.6ºF I dropped the tub and measured my hand and it was 94.5º That is only as close to two degrees different as makes no difference. The room temp and start temp for the lid was 72ºF. Measuring the bottom of the tub bare is the only safe way. and removable substrate can be moved so the hottest possible contact temp is what should be measured. I won't start in on the accuracy of pyrometers I'll leave that be.

Lets guess at a higher heat we experience a 4x change (very generous here likely 1.5 or 2x max...) so 8º difference and at 130º -8 122º unacceptably high. Maybe aerogel at 1mm could do what you are claiming.