I don't have the 80, but I'm assuming the 43 is about the same size. It just won't fit in there, the lens extrudes too much from the body. You could easily fit it inside by storing them separately, and just carry it around attached when you want to use it.
I carried it comfortably in my Billingham 445 with the 43 lens + viewfinder, with the other gear I was carrying across Europe.