I have never had a pair of boots that were comfy and light for lots of walking an still be warm enough for really cold weather on the tree stand. The metal platform of the stand leaches the cold into my feet, making them miserable and very unhappy.
A good option, if you don't want to buy at least 2 pair of boots is the insulated over boot cover things. I have never tried them but I think they would work good.
That being the case I would buy a pair of good quality boots, Gortex of course, with about 600-800 gr Thinsulate. Carry the the boot covers in your pack and then put them on right before climbing up.

DO NOT SKIMP on your boots. They will make or break a hunt. I, for years, wore cheap boots and my feet were always my weak link. About 8 or 9years ago I said, screw that, and went out and spent about 175.00 on a good pair of boots. Good boots are less than that now(thank God) but I still will never skimp on boots.
Stick with name brands, Rocky,Danner, Sorel,etc. I have hadall and been happy with them.
Stay away from cheap brands, they will leak and fall apart. They are junk and you will have toreplace them about every other year.
Right now I have4 pairs of hunting boots
400 gram,early season, Rocky
800 gram, kind of cold temps,Rocky
Sorel pac boots for colder temps(these are like 30 years old!)
2000 gram, big bulky, monster boots for really cold weather in a tree stand,Cabela's brand

If it is a long walk to my stand I will wear the 400 or 800s and strap the big monster boots to my pack.
I'll swap boots at the base of my stand.
My feet like to be warm, dry and happy!