For anyone interested, I picked up the German filmArt BD of
High Crime and watched the longer cut. The film is excellent, and I can't imagine watching the shorter version when seeing the film for the first time, as I did. Additionally, for those like me who loathe watching a movie where all or many are dubbed, there is a lot of evidence to support watching the film in English as opposed to Italian, because at least Franco Nero and James Whitmore have looped their own English dialogue and on top of that, virtually every major character is speaking lines in English, with the result that very few lines are spoken in Italian:
https://forum.blu-ray.com/showthread.php?t=351597
The UK BD will still be bought thanks to those extras and my own curiosity to see the shorter export cut, but it sounds like the longer version really is the one to watch.