Those both sound like fantastic editing ideas... though greatly ambitious. I can picture how Generations will have Kirk live; but, inserting Hicks and Newt would be quite an extraordinary achievement.
I unfortunately don't have the skills to edit this; however, I'm very curious on how you plan to achieve this. ImperialFighter, I'd love to see/review your Alien fan edit cut list if possible; though, I'd understand if you wouldn't want to share it.