Pete,
I'd throw in a Sam splint and a couple of triangular bandages and some cyalumes. How are you going to carry this kit? I'd suggest fitting as much as possible in a set of mess tins, although you may be pushing it size wise. Then placing it in a small frameless daysack or bumbag sort of thing and keep it at the top of your main pack. An alternative would be something like a PLCE waterbottle pouch slipped onto the waist belt of your rucksac.

My tuppence worth.

Johno