Advanced medic rules have been used for years out here in central Canada. Typically at milsims what you'll see is medic carrying around rolls of tape, or individual bandages and then applying them to persons injured.
Last game I hosted I actually handed out individually wrapped triangular bandages, worked pretty well as the medics only had about ten of them and needed to be resupplied to provide further medical support.
What I would like to do in the future is put together some "medic bags" (backpack style) that medics will have to carry around. Nothing like extra gear/weight to make a milsim suck more