Just to update this thread:
I took some time to weigh my sleeping bag and it was heavier than I first thought; just a hair under 3 lbs. A bit heavier than I want. It does not completely unzip but even if it did, while the hut beds do have a pad/mattress with some type of cover/sheet on them, there is no telling how many people have slept on them by the time I get there. A sheet or layer of material of some sort between me and the pad would have made me feel better.
The GoSnug blanket looks nice and I like merino wool, but how packable/compressible and light is a twin size blanket? $300-400 is a hefty chunk of cash as well!
Of everything I've come across so far, the Big Agnes Cross Mountain 45 is the most interesting.
https://www.bigagnes.com/Products/Detail/Bag/crossmountain452017
Weighs 1 lb. 13 oz. No insulation on the bottom so it seems to me it would work well in my van on the fold down bed and in any situation wear a pad/bed was provided but no sheets or blankets (eg. crashing on someone's couch). I would like to try a summer bikepacking trip so this could work for that too. I need a new pad so I could get one of the Big Agnes pads and have an integrated system. And I could pick the bag up for a little over $100. Anyway, those are my thoughts so far but appreciated the feedback!