Pretty much what I do, only I rarely tape the warmer on. It's nice to be able to lift my toes up tight to the top of my boot, and feel the heat of the warmer.Here is the secret, tested on a Saskatchewan deer hunt, 60hrs on stand, as in 6, 10hr days. And no, didn't get anything....
Anyway, I took felt pack boots, artic shield boot covers. The secret is, I taped hand warmers over the toe box on the pack boots, then put the artic shields over the boots.
Feet never got cold. I only wore thin liner socks , so I had a lot of air apace and room in the boots. Don't lace the boots tight, it cuts off circulation in your foot.
Temps were single digits several days, no problem.
You can even tape the body warmers, if you want more boot toe box coverage.
Warmers, electrical or duct tape are your friends.
I waited till I got to the pop up blind to complete the setup. You can do the same thing in a tree stand.
You could probably do the same thing on leather insulated boots in the teens and 20s, without the boot blanket, and keep your feet warmer.
You can feel the heat on your toes coming through the boot.
Easy peasy.....
Before I had boot blankets, I'd tape the warmers on, then wrap in an old sweatshirt. Worked just as well, but was less convenient.