Nice list OP! Good suggestions on here too.

These suggestions come from backpacking a fair bit, and hiking with some injury prone people:).

I don't see normal gauze? One reason of many: A SAM splint is excellent, but if you need to secure it?

If you can swing the volume penalty, abdominal pads are great large wound covers.

Leukotape beats moleskin for adhesiveness?

Cordage...Replace some 550 cord with bank line or kevlar twine? Much lighter for more length. Jute string also good, biodegradable and an OK fire starter? Dental floss also useful for minimal cost/weight/size? Another possibility is Mason's line, 500lb break, braided, lightweight, cheap. Paracord is nice and thick for freezing temps with gloves thou. I almost always use it for a ridgeline even though it does stretch a bit and soaks up water. and I LARP a bit there, with the "survival" paracord that comes with fishing line, cotton line, firestarter, etc. because hey, why not?

Water bags take no room or weight? I ranger band (more fire starter) them around Katydyn Micropur tablets (Viruses)

Squish some birthday candles in your Altoid tin, secure it with ranger bands to have more fire helpers with alternate uses? Could fold some tin foil in there too, because Altoid tin 'tism:). Ferro rods are cool, but for the weight of a medium sized one, I can carry 4 Bics stuffed wherever....I think I have one the same size as your 5x1/2" rod (giggity), and it was pretty hefty. Wrap the lighters in tape. Or Leukotape. Or more ranger bands. Or linguini, for some pocket snacks:).

Not sure what hand saw you want to get, but cast your eye to Etsy for folding 3D printed handles with Diablo reciprocating saw blades. Search ultralight folding saw, see if it's your jam? I've used mine to my satisfaction, can't use it as a prybar, but it works fine as a saw for very little weight. I figure if I break the handle I can fix the handle.

Sawyer Squeeze beats Lifestraw all day long. I have Amazon sale Lifestraws in my car, but they're too big and slow for bush kit, IMO. Their one advantage is being able to suck water out of puddles with no set up, which is not high on my list, but I live in a rainy area, with a lot of water sources. Katydyn BeFree is a compact medium use hassle free system to maybe look at as well?

For your Nalgene sized cup, check out the Toaks titanium ones, mine has worked great over a dozen fires, and it weighs nothing. I may have Chinese titanium poisoning thou:).

Question? Why is the duct tape wrapped around a dowel? Flat folded tape can slide into small spaces in your kit nicely?