“Those wraps work from body heat. Maybe using one of those wraps to convert a regular heat pad might work. If you’re taking the cylinder route then I’d start with a thickwall cylinder which will take up most of the length of the LED head, reduce cracking potential and improve the seal possibilities. A good pillar drill with a dremel grinder tip or very unagressive drill bit would probably be a useful setup too.
I still think the wrist strap would provide the easiest and cheapest solution though.”
I didn’t read this closely enough and thought you meant wrapping the wrist straps around the tube. I have not looked at the graphs, but what about unbreakable glass? As a kid, we had some long tall unbreakable water glasses that could be modified into a pump cylinder. It seems to me that one would be much closer to the finish line by finding a and modifying a tube material and then wrapping it with an IR source than the other way around.