If you watched that documentary on the workprint disc, they talked about pulling the reels of film out of storage and there were several slats stacks up high with film canisters all containing footage from BR. I'd imagine that out of all that there would be a good deal of filmed footage that was not used. Even if the farm scene was filmed, I don't suppose it is likely ever to see the light of day. The fact that it was not in the movie to begin with shows they either scrapped the idea before they filmed it, or they filmed it and decided that they didn't quite like it.