I have a device with a two conductor cable that I need to interface to a signal conditioner with a BNC input (same as that on a standard oscilloscope). I would rather not use a hacky solution like a screw terminal to BNC adapter and directly terminate the cable with a male BNC plug.
Ok, I now think I get a better understanding of what you need. A few vendors offer a pre-wired BNC which is mainly used as test leads. Digikey has something like it, but a simple "2 wire to bnc" google search will return a few hits.