^I think that would pretty much be my ideal ROTJ opening, except I would put Ben after Luke saves them.
Use the sandstorm scene. Instead of going to his X-wing, Luke goes to his old house.
There, while reminiscing, he sees Ben's ghost.
It's kind of dumb that he would go to his house, but it does fix a) Luke showing up late to the briefing, and b) the only reference to the fact that Luke spent 19 years of his life on this planet is a throwaway line.