this past Feb I was in N.GA mntns and it went down to 31 degrees. No winds
I used a 3season yeti & 3season burrow w/ superfly tarp. Tarp wasn't pitched low -- I wanted to see the creek I was sleeping next to.
Was wearing BDU pants, regular short socks , tshirt w/ hoodie. Used my down jacket for pillow & a fleece hat. Forgot a pad for my feet but the burrow did its job. I stayed nice & toasty!
However, if I need to add heat to the above setup - I have these pieces to add...
The hammock socks adds warmth in the cold & I used it as my only UQ this past summer when it was above 70degrees
The rain poncho I have not had the opportunity to use but when testing in an unheated garage at about 50 degrees - it got hot!
seeing you have a WBBB -- if you are a DIY person here's a simple top cover to make - which would prob be lighter than a poncho (poncho has dual purpose)