I just did my RV-14 bulkhead this week. I used some 1/2 or 3/4" round weatherstrip, just glued in place in the "V" with some clear RTV. There will still be a very little bit of gap, but you can either leave it or seal it with the same RTV. I let it set up a short time before installing the bulkhead wall. Took it back out tonight and looked at it. Should cut down on some of the cold air coming in.
Now, that said, I did NOT seal off every single one of the corrugations. The reason is, with the high flow available with the air vents, you're going to need somewhere for the air to go. If you seal the bulkhead completely you're just going to make the air vents less effective because there will be nowhere for the air to go, and the same with the heater vents. If you are going to flow high volumes of hot or cold air in, you're going to need it to exit too. Also, on the RV-10 when in flight, the doors are being sucked out with quite a bit of suction from the airflow over the airframe. If you add some additional air pressure inside, you're going to potentially make that worse also.
So, in short, I would definitely NOT recommend sealing the entire baggage wall, but just seal it enough that you minimize the amount of cold air that will come in from the tail. Keep a pathway for the hot/cold air from the front to exit. There are lots of other little places where the air will leak out, into the wing roots by the aileron pushrods, and places like that, but some people also have bellows on those too.
Just things to think about.