Cabelas has two models of nylon-topped Sorel pacs. Type in Sorel pac Bear Glacier into the search engine on your browser, and you will get many hits.
Having used a pair of Sorel Snow Bears for about twenty years, let me tell you that even with the 9mm wool felt liner, I get cold on stand. Maybe my circulation is poor, too.
Boot blankets would be a big help, as I have found that putting any spare clothing over the rubber shoes will keep me comfortable longer. The blankets are bulky, though, and I think a thinner covering, more of a lined wind block would be adequate.
Grabber, a maker of hand warmers, also makes an insole that will keep your feet warm. The warmth makes a wicking sock of prime importance, though, as your feet will sweat more. I tried them this year in a pair of "small" Sorel Broadways, and they did fine. I went out to sit, and then slid the insoles between the shoe and the liner. My feet were warm all afternoon and evening, though I admit that the temps were mild.
Killdeer