Vidar, agree with you completely on packing the right layers and not relying on a power source. Almost everything I wear is merino from summer through to deep winter weights. Recently i have started embracing alpaca, still not sure about the claims its warmer for less weight over merino but it works at least as well as the same thickness in wool.
Not sure about alpaca, but on the exotic side here mosk ox wool has a good reputation. As the animals have the unfortunate combination of aggressive behaviour, not being afraid of humans, and simply being huge, the wool can be hard to come by. Keeping an eye out for the nearest tree and bringing food and drinks to potentially stay up there for a long while is supposedly part of the charm. It is typically merino wool for me all through winter. Sometimes in combination with a more moisture transporting inner layer if the activity level is high.
One issue for equatorial and southern hemisphere region is the sun is stronger than european/ North American
Feel like i may have fallen into the gadget trap. You know the one, where you keep deviating further and bulkier from the compact starting poitn.