I feel your pain. Cold feet is one of the things that will force me out of my stand early. Cold anything else I can muscle through it seems like, but once my feet are cold, it's over.
I have a pair of the Arctic Shield boot blankets, and they seem to work well provided you put them on BEFORE your feet start feeling cold. If you wait for your feet to start getting cold to put them on, they don't help much.
I also have an IWOM XT that I use when the weather gets below 35 or so.
Depending on the weather, I use the adhesive toe warmers (placed on the top of the foot on the outermost sock), a "kidney belt" that holds hand warmers at my kidneys, a large handwarmer in the "kangaroo pouch" of my hoodie, and the aforementioned IWOM and boot blankets. The kidney belt helps a ton in ensuring core temperature stays up. Unless the temperature is sub zero, I'm walking in wearing only a hoodie and pants, and then donning the IWOM and boot blankets in stand. If it is sub zero, I'll add a thermal base layer and maybe even go with a fleece jacket.