Paws, what kind of boots are you wearing? Have you tried a thin wool sock inside your drysuit socks (if any), inside Chota Mukluk boots? When I had a drysuit with ankle gaskets, just thin wool socks inside the Chotas was warm enough for CO cold water, which sometimes was literally just above freezing. That was when I paddled a plastic kayak. You do need to get something warmer before your glass boat arrives, because those are colder yet. When I later bought a new drysuit that had Goretex sockfeet, my Chotas no longer fit, so I just bought some 3mm booties one size up from summer fit. However, mukluks are warmer. Surfer shops sell really thick neoprene booties, 7mm thick.