I'm also type 2 diabetic. Those who are not have difficulty understanding cold feet. I sleep with no T-shirt at night and still sweat with the thermostat turned down to 62, but my feet are cold when I get in bed and cold when I wake up in the morning.
The only thing I have found that works for me on stand is more insulation. I have a set of over-boots or boot blankets, whatever they're called. A toe warmer on my sock toes help. Obviously, I can't walk in wearing them.
The other thing is a German Ansitzsack. It's like a sleeping bag out of heavy wool loden that comes up my back to the top of my shoulders and suspenders that fasten to the bib front. It traps much of my heat and holds it down around my lower body. It has a zipper down one side and across the bottom so I can pull it up, climb a ladder stand, then roll it back down and zip it across the bottom.
I don't think there is an easy solution for us "cold foot" sufferers.