Get a canoe with a square stern or rig up something solid with marine plywood and PT lumber to add to yours. Keep it as light as you can.
We have some square stern canoes already.
I am contemplating taking a mad river royalex canoe into the cabin to have there to use in case of an emergency. If all goes to crap, a good mad river canoe would be reasonably easy to portage, even single-handed and much more efficient as far as paddling goes.
Th question comes from how to efficiently get the canoe in to the cabin. Hence the ? about a motor mount to help get in without taking an inordinate amount of time paddling in.
