I had a quick look and couldn't find anything on an official French DVD release. If it looks, as you say, better than your NTSC LD rip then it's unlikely to be from VHS; maybe it's a bootleg from the French LD?
If you capture your NTSC LD audio and video, it's not too difficult to pair up the audio with a different video source. You might want to start a thread in the technical help forum, when you've had a chance to compare your sources, and you know exactly what you are aiming to do.