It is rare, but it can be done. If you are willing to take a kit with the 150mm instead of the 80mm, you'll have better chances (every body wants the basic 80mm kit-- why is a mystery to me, if you want a normal 6x6 just get a TLR).
I agree entirely. I used to have an RB67 with 50mm, 90mm and 180mm lenses. It hardly ever went out with the 90 though as if I wanted a 'standard' focal length, it was easier to just take my Rolleicord.
"People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.