Just the kiss allows for SR to happen. Just that. No other change is needed. Its not like you said with the prequel/OT trilogy analogy at all. One scene allows for SR to happen with no real probs, and the rest is the new monster, derived from Donner/Lester.
I still think that the new edit should Donner's Cut, enhanced with the better Lester scenes. I really want to hear which movie should the basis for the re-edit, Lester or Donner's?
Commander Courage's and mine are Lester. I suppose booah says so too (BTW, I kind of agree with the Lara idea of yours, but will need more convicing).
MORE importantly... IF anything is decided, do we have editors lined up for something like that? I'm curious...