Have you tried insulated boot covers ?

Even L.L Bean has nice hunting boots

Well ,
if was planning on sitting for any length of time in cold weather , I'd probably be looking for a "felt pak" style like Nokia or Kodiak. Not the type of boot that you'd want to walk far in, but with a good layering of socks they will certainly keep the toes warmer than most others that I can think of. I have both these and 1000 g thinsulate/ Gore-tex styles and for just plain sitting on the watch, give a felt pak any time.......just my thoughts......anyhow

Im always using two pair of good socks the good socks always come in handy in any situation a pair of thin hunting socks that can breath and over em a huge pair of woolies.

I bought a nice pair of ASOLO hiking boots, they are made mostly of gortex and they are the best boots I've ever owned, they always stay dry and are pretty warm with a nice pair of wool socks.

You could always get some hot-hands hand warmers and stick them in ur boots

Danner Ft. Lewis 200gr Thinsulate ( the originals). This boot has served the vast majority of my biggame and upland bird hunting needs. Sized 1/2 size larger than my normal size to accomodate extra heavy weight SmartWool socks and sock liner in cold weather. In milder weather I install footbeds and wear with midweight wool socks and liner. Always been happy with Danner.

I wear Cabela's 1200 gr. Rubber boots for Whitetail stand hunting. I'm happy with them. Keep toes warm when temp around 10 - 20 degrees.