I saw the new Sorcerer DCP (which is the same as the Blu-Ray master, but at full 4K) at the BFI last night. Personally, when it comes to the bridge scene, I’d say the HD/4K master is closer to the grading on the tape than your regraded still, just with certain primary colours (especially the greens of the trees) pushed up and saturated, which is the sort of thing I’d expect Friedkin (ever the revisionist) to do. None of us know what the correct colour timing is, and given both the cinematographers are dead and Friedkin is seemingly incapable of telling the truth, I doubt we’ll ever know.

To answer your question, the helicopter scenes are in English, but the dialogue has clearly been revised and redubbed so I doubt it’s the “original” dialogue intended when the film was shot, or at least as Friedkin would have them delivered or mixed. I haven’t checked them against the script though.

I doubt you’ll get much out of the German TV rip, given it’s already very dark, quite compressed (825MB file size if I remember correctly) and is in heavily letterboxed 4:3, so lower resolution than any other source available.