Thanks for the tips guys.
I didn't have too much luck with Avisynth but Power Director worked pretty, but I don't think I'll be taking the idea any further I'm afraid.
I was gonna try to do a similar edit of my
The Exorcist III: The Fr Karras Edition with The Exoricist II: The Heretic, taking the african scenes of EII & mixing them in with scenes from Dominon or The Exorcist.
But I came across one slight problem. You see I hadn't watched The Exoricist II: The Heretic for about 10 years & about 10mins into the films I remembered why!!!
WOW that's one bad movie :-o
In fairness the majour problem I had was that the African stuff in EII isn't all that bad, just boring, but when Richard Burton returns to the US at the end the whole movie falls apart. And I don't see the point in editing a film that has no proper ending. :-?