You have a pretty extensive inventory that should do quite well in nearly all foreseeable circumstances supplies will run out, so I would either add some dedicated splints, something like a SAM splint or two, or know how you would improvise a satisfactory splint from materials at hand. Some kind of cervical brace would be useful in a good many trauma situations, as well.

If times and circumstances are bad enough, your dedicated items will run out, so plan ahead for improvisation.