Episode 7 for me would work great if the beginning of the film is about Luke. He's being hunted down by somebody (probably female antagonist), and so he's on the run. Quickly, he picks up a streetwise kid who steals to survive (Aladdin-esque). He catches the kid stealing, and takes the time to tell him what he's doing is wrong and that he can come with him.
They make camp for a night, and Luke has yet to reveal that he's a Jedi. Luke wakes up from sleeping to catch the kid using the force to move the logs on the fire. Luke proceeds to tell him about the force, etc.
Menwhile, Luke is staying in contact with Han and Leia. Han and Chewie are searching for Luke's attackers, while Leia is on Coruscant overseeing the New Republic in some capacity.
As the film progresses, the focus shifts to Luke's tagalong... they meet up with Han and Chewie, eventually finding out that Leia is the real target. Han teaches the new kid how to fly the Falcon, which looks almost the exact same but has been renovated to look almost new.
They rush to save Leia, everyone gets trapped. The new kid watches helplessly as Luke is about to be killed by a female Sith. Luke falls to the ground, drops his lightsaber, it turns off. At the last second, the new kid pulls it to him with the force, jumps in and blocks the attack that would have killed Luke (This is the first time he ever uses a lightsaber). Seeing this, Luke finds enough strength to pick her up with the force and toss her against the wall, knocking her out.
After the battle, Han stands next to the Falcon and says "That's it, I'm retiring. Hey kid, you fly pretty well. I understand you don't have much etc, take her she's yours."
Luke and apprentice fly off, Han, Leia, and Chewie wave from balcony on Coruscant - the camera zooms out - roll credits
By Ep 8, training is in full swing. They pick up a companion for the apprrentice early on. About halfway through the film, Luke dies. At this point, besides small appearances, the OT cast would be done.