About kk650’s hybrid cut, there only seems to be the following differences with your edit:

“All extra shots of Darth Vader going back to the Executor removed” : you’ve kept one of them
“The original emperor from the theatrical release has been returned” : you’ve used Adywan Revisited Emperor
The Wampa scene seems to be the SE version : you’ve recreated the theatrical version
to be confirmed, but I’m not sure kk650 has used the Falcon cockpit shots prior to the 2004 reframed dvd version

Besides kk650’s version provides 3 heavy tracks (1 pcm and 2 dts), hence I’m not sure the video quality is that much better than the 1997’s reconstruction you’ve used.

The best solution would indeed be to regrade the original bluray file, if possible with a less time consuming algorithm. At least for Hoth and Bespin (the pink saber…).

Another solution - but you won’t like it - would be to make an alternate version of your project using the bluray video untouched, for video quality consistency from Episode I to Episode VIII. I myself find the colors good (I like better the revisited colors though), only main issue being the pink Vader’s saber which really looks bad.