I’ve tried layering in the tree. I find it to be a royal pain, between making room in my pack for extra clothes, or lugging a jacket around another piece of gear for the walk in, or partially undressing/dismantling my setup to adjust and dress with ropes under tension and such…I just fully dress and leave my outer layer(s) unzipped if I’m concerned about overheating. Quality clothing=fewer layers also, which helps across the board.
If you truly don’t want to walk in fully dressed, maybe change at base of your tree. Seems like a lot of commotion and also like a cold, time-sensitive task. I also don’t know if sweating matters so much when the alternative is potentially freezing, six in one half dozen in the other if you ask me. I’m the kinda guy who gets to his tree and wants to do as little as possible in as short a time as possible to be up and actively hunting, especially in the cold/with layers.
i take my jacket off, add mid layers, and put the jacket back on all the time
the trick is to do it while you are still warm from the climb and don't think you need the mid layers yet
with your body heat up (and slap on a few hot hands adhesive body warmers on your base layer), you heat right up
it's not a problem to me at all and works great
i won't remove bibs or boots in the tree though
arctic shield boot blankets for the feet and then various overlayers for the bibs
a larger sized, stretchy fleece pants pull on right over boots, bibs, and saddle and add warmth
or if i'm really cold, i break out the full side zip down pants and put them on right over the bibs and saddle.....someone walking by would think "how's that guy got ropes sticking out from all his layers?"
i (and i think a few others) am not great at accurately estimating my layer count.....my trick is to walk in with one less layer than i think i need and when i setup to immediately put on one more layer than i think i need, and that's usually the correct amount