I believe the thread you're referencing was a Steve Evans bit w/his cuben duomid and a TiGoat stove. (Hey Steve, did you ever install a stove boot?) This makes me wonder about your comments about leaving the door open, etc. The TiGoat stove is more geared toward heating a tent and uses a stove pipe. The TiTri Inferno is a great woodstove, but it is not remotely intended for use in heating a tent... not sure if that was your plan, but just in case...
The Inferno burns great... much better than my MYOG "not-bushbuddy." The system is about as fuss-free as you can get, light, compact, and efficient. If I were going out for a multi-day winter trip, though, I'm not sure that a woodstove would be my primary unit. One big reason, right off the top, is that I like a large-volume pot for melting snow, and my Inferno is sized for my typical 0.9L pot. But it sounds like your questions are generally more about shelter.
First thought was that if shared sleeping bags didn't work for you, a shared bivy sack won't work, either. I do really like a large mid for 2 people, used as you described. Oware, MLD, or BD options are all good.