I’ve occasionally thought of making such a thing. A combination of the 1993 and 1997 mixes would probably be the best way to do it, but in some places that wouldn’t work and more creative editing would be necessary.

Any such thing could only ever be a rough approximation of the mono mix in stereo form, of course: the mono version has so many changes to the balance of the mix that for many of them it is probably not possible to get any results that truly resemble it. The 1997 version did add many mono mix effects, but they are often quite loud compared to the rest of the track, much louder than they were in the real mono mix. To actually blend them relatively seamlessly would take a lot of effort… if I cared more about the mono version I’d probably have already tried to do this, but since I quite prefer the mix balance of the stereo and 70mm versions I could never really be bothered. Still, one day I may end up trying it.