I know he's going to make them "almost unrecognizable" but using existing footage.

Anyway, here Post 251 there is the Bingowings' post about Solo / Fett. It's not possible to make it works in a ROTJ edit because of the missing footage but I think something could be used in a work like this.

And about mandalorians, they could be, 40 years after ROTJ, maybe the greatest military power of the galaxy. And their mercenaries. Every faction with enough money can buy their services! They could even cheat some or more faction by being double paid...

And they could think to cheat everyone, even Thrawn's Empire. But Thrawn foresee that and surprise everyone by not falling in the trap but instead using it against the enemies.

I was also thinking to a good beginning for episode VIII, something that recalls ANH. A spaceship attack, by hutts, smugglers or someone else, against a core-worlds ship. Inside the ship we see 3PO and R2 and 3PO says that all of this remind him of something else. But luckily, this time no star destroyer!

The droids reach the command bridge where we see the aged Leia and Han. And chewie of course.

And here we have a star destroyer exiting from hyperspace

3PO: we're doomed!

The star destroyer, instead of attacking Leia's ship, defeats the enemy vessel with some strategies that seemed crazy at first and then - when successful - absolutely brilliant!

After the SD's victory, Leia's ship crew try to take contact, but the imperial ship disappear in the hyperspace. Han order to calculate the route, and an officer says they found every possible destination.

Maybe during the battle we saw the SD interior, maybe thrown from behind, or just the voice.

And this could be the starting point for a quest in the unknown regions, led by Luke, in which Jaina will decide to begin her training (and we'll follow her growth process during the three movies)