Current EMT here. Not as much training as you have, but maybe that helps for this.
Seems like there’s a few things on there that require a bit of skill to use that a regular person wouldn’t have. Not sure a decompression kit, or an NPA/OPA would be very useful for an average person.
I think you’re over packing on a few things. Some of these, like Hemostatic gauze is good, but it expires. 4-6 packs of something that’s kinda expensive, but goes bad in a few years, doesn’t really make a lot of sense. We’re not even required to stock that much on our ambulance. Same for the chest seals. I would think 1-2 of each should be fine.
I would add 1-2 sam splints, triangle bandages, and coban/self sticking tape, eye wash, and Narcan if you can get it easily/cheaply.
Rear cameras are required, which means some sort of screen is required. Might as well make it a touch screen so you can cut costs on wiring and installing buttons if you already need one.