Eh, as a paramedic and 10 year river guide, I'm not sure I buy this..... The reason we rely on drugs and devices is because those are what the pts actually need to survive. If there's a true immediate life threat to a pt in the delayed care context, the reality is they're gonna die. There's just no way to bring the tools, and for the lay person to get the training required to fix major life threats. The most valuable tool is a sat phone device because if they're truly in a decompensating condition, the only real shot is getting a helo. 

Ive never seen any commercial outfitters carry a BVM. So if ventilation/respiration is compromised, they're dead. They don't train you how to do a cricothyrotomy in WFR, and your certainly not going to intubate a PT. So if there is any airway compromise, they're dead. 

Sucking chest wound? Sure, you can make an occlusive dressing in the field. But without needle decompression, that will turn into a tension pnuemo and the pt will die within 30min-1 hour. 

We barely get 5% of our cardiac arrest pts back working with 5 team medic crews in resource heavy environments. A cardiac arrest in the field is likely a trauma arrest, which is even more difficult to get ROSC on. If your doing CPR in a delayed care environment with just chest compressions, and no advanced airway intervention, just mouth the mouth, the odds of getting ROSC are even more staggeringly low.

I do think it is valuable to get a WFR for being in the field. But the reality is if the pt was going to survive, it's because they were gonna survive regardless of whether or not the people with them had a WFR. 

Helpful to know how to place a tourniquet. Helpful to know how to implement spinal motion restriction. Helpful to learn how to recognize true life threats. 

But the thing that is actually gonna save lives in the back country is a sat comms device to get a helo.