Robert,

Do you have a website for documenting your project? Sounds like a project more than a trip!

If this suggestion was mentioned already, sorry. You might consider using hand-warmers as an antidote to hypothermia. You could put one in each armpit and one in your crotch where the arterys run, as well as gloves and boots. This can save your life. If you're camping on land you can heat up rocks for the same thing. But offshore, if you're in hypothermic trouble, the handwarmers might be welcome.

Also, I'm sure you already know, don't drink cold fluids or eat snow, or cold food. That can start a hard to reverse internal temperature trend. Hopefully your stove works in your kayak.

Good Sailing and Godspeed

Michael