Definitely wasn't planning on going only fat/meat, but it is worth noting that this diet worked fine for the people who lived off it for centuries, if not millenia, for example the Inuit. In fact, carbs really didn't do them any good at all, diabetes, all kinds of nasties that weren't present when they were living off of meat/fat. Interesting stuff there. Probably some adaptation biologically of course.
Apparently also some Norwegians went to Alaska recently to test the no carb diet, and ate as the natives ate, fat and meat, and the results were excellent. Again, not planning on doing that myself, oatmeal and dried wholewheat bread do me fine as well, but I know what I was missing last trip, and it was fats. Plus my trail mix was too dry, started getting to me after a while. The key is that they are eating real, natural meat and fat, not hormone pumped, grain bloated, artificial stuff. That can't be ignored, although it usually is.
Pemmican is fairly easy to make, but it's important to use real meat, not industrially grown stuff, especially for the rendered fat, where you can really see the difference between grass fed and commercial, corn fed beef. That's high on my list of next projects. The taste issue doesn't really concern me, I assume when it's well made it will basically be like eating a meat candle, give or take, since it's literally tallow and ground up powdered low fat meat, 50/50 split by weight I believe for the real thing, give or take.
It definitely should not require refrigeration if it's properly prepared, that's the entire point after all. Same by the way for cured hams like Jamon Serrano, those if real are made to be used without refrigeration. Not as long lasting as pemmican, which apparently can last years if you make it right.
But for the weight, pure fat plus protein is pretty hard to beat.
To me this is the ultimate in light fast gear, and helps unplug one more part of the experience, as in MYOF (make your own food).