Taurus, you are way more prepared than I am in this regard, but I do see one simple thing that you might consider adding, which is a blanket. Almost anyone suffering from such injuries, those serious enough to use any of the things mentioned as being in your kit, is likely to also be suffering from shock. And I'm sure my training is not as extensive as yours, nor is it as recent I bet, but keeping a shock victim warm has always been something I understood was important.

I've left one old, wool blanket on a road after an accident. I doubt the kid who passed me on the sportbike moments before he broke his leg can recall anything about the blanket.

Anyway, maybe you should add a mylar blanket or keep an older one on hand.