Don't read the language the website is posted in so only going on one photo
. It looks you have other than a steel
boat. If you are concerned about punctures, I wouldn't go on anything but a steel
hulled boat. Metal boats will dent and deform rather than puncture except in very extreme conditions. Sailing the NW passage
just isn't the place for anything but the ultimate in strength.
Flotation devices would probably fill the whole interior
of the boat on a typical monohull
sailboat. The only way to get around this would be a total redesign of the interior
of the boat around the flotation device so it's deployment would still allow some below decks living space. Failing that, a life raft is your best proof against hull puncture.
Assuming the damage will mostly be close to the water
line from floating ice, water proof canvas
commonly called collision
mats. I think, are probably best way to deal with punctures. Made up before hand with many grommets so they can be deployed in a variety of ways. You definitely need to practice deployment practiced before it's needed to work any kinks. The ability to dive in the frigid water to deal with a puncture from the outside is a aslo a must have. Probably a dry suit and appropriate dive gear
and other chemical fixes may not work because of the temperature. Can imagine how long epoxy would take to go off in freezing water.