Jim (Small farmer) has one. Joel had one. Apparently, before the first BCS America went belly up (the one out of North Carolina), they were trying out several different attachments that were made in tiny quantities or never saw the light of day. You'll occasionally see a very different kind of chipper than the current ones they get from Caravaggi. Those early chippers were made by Lindig in Minnesota.
There were also many short line attachments offered by Paul Sullivan when he was selling BCS under his Mainline name. He had a feed grinder that I wouldn't mind owning.