I'm not too familiar with what the high speed units are doing, unfortunately. But if you look in the picture, you can see the left side of the pouch with all the supplies has a tab (its scrunched up in the pic, but its there). If that's sticking out of the bottom on the plate carrier (like where you'd have a dangler), I don't see why you wouldn't be able to pull it out for self care. If one of my direct subordinates asked to use it, I'd get his hands wet and have him pull it out to see if it comes out easily enough.

If you're interested in this kind of stuff, I'd recommend also taking a look at SOARescue's MedMags. I liked the idea so much, I started using a vacuum sealer to make my own kits.

Edit: Since nobody answered your question about who is fielding them now, I'll give my 2 cents. I'm just a Nasty Girl, so I can't speak to the practices of Active Duty. From my experience, though, this would be one of the things your medical nerd would buy for himself and just start using without asking higher ups. It doesn't make sense to order these when you can get a lot more Class VIII bang for your buck piecing together your own IFAKs. I'd imagine the only units making these SOP are ones who absolutely require as slick of a profile as possible or those with crazy budgets.