What do you think about this - For the conclusion, maybe right after the view on Lando when Ackbar announces that he'll lead the attack, we get one last glimpse of Han, Leia, and Chewie (preferably not reused footage) sitting there quietly (ideally Han would first be looking over at Lando then back up front). This moment of pause may be just enough before the next shot which is probably a view on Mothma, Madine, and Ackbar (again, preferably unused footage) with Ackbar saying the concluding words - since his mouth is not a "real person's mouth", he'd be the easier one to dub over. Ackbar actually does say later in the movie "May the force be with us", but if it's in your abilities, you might need to tweek it a bit so it sounds like he actually says it in the briefing room, not the command room. After that shot, show the droids, and I think you'll have it. I guess you'll also need to work with the background music to accommodate these changes.

I know I make it sound easy in writing, if only it were almost as easy to actually do it :)