I don't consider any chain drive motorcycle a DD.
Why not? Drive chains aren't that much trouble to maintain.
Would a CB750F 1975 model be a decent daily driver? I'm thinking of selling my VN750 and using the CB as a daily driver.
Just about any motorcycle, regardless of its age or use of a drive chain can be a great daily driver as long as it's in good mechanical shape. My 750K1 has been my main transport for several years now, and has hardly given me any trouble in that time.