Instead of the Vong, have the threat in ROTJ be a secret Separatist fleet where each ship has a mini Death Star led by Viceroy Gunray whose spirit survived ROTS and was reanimated into a cloned body and Vader is searching for this secret fleet in order to control the galaxy after the Emperor died and left him all his Imperial ships which already control the galaxy and Yoda dies but Luke has found a secret holocron which tells of the location of this Separatist fleet and he learns how he’s actually the cloned son of Gunray which means he’s destined to become the leader of the Final Trade Federation and he must resist this temptation in order to use two lightsabers he didn’t build to beat the clone of Gunray while dying in the process but luckily Vader tuns good and brings Luke back from the dead leading to a romantic kiss and then the Separatist fleet blows up conveniently and the galaxy rises up against the Empire off screen and Yoda’s body finally disappears and Chewie gets a medal for winning the Clone Wars and Luke goes back to Naboo and buries some lightsabers in the sand and tries to guess the names of the birds singing.