Can you widen the flume on the structure first?
I personally don't know about the re theme for the area. America's military valour extends many many years and there could be a tonne done on it so this little spot in DCA might not be the best place to try and fit that theme. Also Soarin would seem an odd fit after the land was re themed and I think the film would suffer if it was given a storyline other than exhibiting the most beautiful vistas Disney can film.
The only difficulty here would be getting the last diners out on time while also getting all the tables clean for the new people coming in on their heels in the 8 or so minutes. That ammount of time should be good but I would suggest that each theater have some back up time wasters programmed in case of a slow load. It was unclear if this is what the side movie projecter was for, but this would be a good use for it. Extra clips could easily be shown if a backup occured.