I would try to create a natural blind at least as an option. All they need to do is bust you once with a few deer around and you educated an entire herd.
have at least an option of a blind in case the wind is NOT in your favor for the tree. I have had a lot of success hunting on the ground - specifically around pine trees. One year, the deer got so close I couldn't move without them seeing me. I couldn't pull back my bow and as soon as I twitched BOOM!! They were gone.
Advantages and disadvantages to both, but one time is all it takes in that situation and you've got either a herd educated or need to take a week off of that place.
One other option is put something in the tree that looks like someone is in there. They'll get used to a dark blog in the tree and won't think anything of it when you're sitting there "at the ready."