I've always wondered if there was a Demo with the beach boys/Brian on it somewhere hidden away from that time..
I think that's part of the ( lost) Jan Berry Archives
Yeah, since Jan didn't get a complete song from Brian but did finish it himself, I doubt that there would be a demo with any other Beach Boy involved than maybe Brian. He is of course is on the hit recording. We'd need to ask Mark A. Moore to learn about it. My guess though would be that it was a Jan Berry demo.