Recommendations for winter shoe options for canoeing

Check out the Neos Overshoe line.

Your post about the weather got cut off. If the water is cold, then immersion is a serious risk and swimming with boots would be really hard or impossible.

As you noted, NRS has several options that are more boot like for better hiking. Chota makes paddling muklaks that are similar to the boundry shoe, and so worth looking for. I have a pair of muck boots.

http://www.muckbootcompany.com/outdoor-sporting

I use them around in the yard and garden and to walk the dog, etc. But they are pretty warm, and I wear them out in the winter too. They are also waterproof and light (ish) and they float. I have thought that if I do an early spring paddle trip, where mud and cold water would be a serious concern, I may try to use them. They wouldn't be great for a portage, but with good socks they are pretty comfortable (not sure about wearing them all day, but that will be true about any of the waterproof options).

My daughter (who has led 6 week long expeditions above the Arctic Circle) says the Muckboots "Arctic Sport" boots are on the short list of durable, functional footwear for serious cold (i.e. freezing water with ice mixed in) lake/river travel.

http://www.muckbootcompany.com/products/ASP-000A

Tim Smith, a Maine canoe guide and wilderness skills instructor, likes knee-length Tingley rubber overboots with mukluk liners and felt + mesh insoles. They have a loose fit which allows for improved circulation, but they feel a little weird hiking in them. I haven't yet tried them on a long hike.

You could also probably get a pair to fit over your hiking footwear, but this wouldn't be as warm.

The boots, liners, and insoles weigh about the same as a pair of all-leather GoreTex hiking boots.

http://www.jackmtn.com/gear.html#footwear

As a sea kayaker who has kayaked in winter I can say unequivocaly: you MUST have a dry suit W/ thick fleece insulation under it. Plus a thick neoprene diver's balaclava for your head, thick neoprene booties and neoprene mittens. PERIOD, no exceptions.

Cold water immersion kills people every year. Don't take this advice and, especially in a canoe, you will be putting your life at high risk. I am a wilderness canoist and held an American Canoe Assoc. Moving Water Instructor's Certificate so I do know whereof I speak.

Even in summer immersion hypothermia killls. In the late '70s a U.S. Boy Scout canoe group had several deaths on Hunter Lake in Quebec's Kippiwa Game Preserve when their canoes were upset in a sudden storm. Boys and adult were found dead, floating in their PFDs. All died of hypothermia.

BTW, I've canoed Hunter Lake. It's COLD even in summer.
None of the advice I've seen on this thread addresses the extreme danger you will be in. I'm not trying to be an alarmist. I'm trying to get you to do some SERIOUS research on the subject before you become a statistic.