So, it looks like what everyone's suggesting narrows down to:

Alpaca/Silk

Alpaca/Wool

Wool/Silk

with an option on taking a weekend boat trip to Qanaaq to see if I can find some qiviut yarn, or sending money with someone to look for me. (This option has a very short window so it probably won't happen. Winter is coming.)

And merino is really soft wool, so I could switch out merino in any of those blends? Or am I confused and by wool you mean, say, normal everyday wool with the alpaca/silk to make it softer?

Merino is just as warm as wool, right?