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Could you get to the remaining wet foam by removing a piece of the bottom, like maybe a 6 inch circle? To answer your question, yes I would pour the foam before replacing the deck. With those strips of plywood epoxied in place it would seem the deck would fit perfectly. They would also provide a little support to the finished deck. You don't want any voids under the deck and making sure there are none before you epoxy the deck back in place would in my opinion be the best solution. I'm not really familiar with your hull so I really don't know if that 45 lbs is significant. I will admit that you will have probably a relatively dry hull compared to all the other 13 hulls of your vintage so maybe you shouldn't worry about it.