There is a special Wookiee mode that can be enabled for Smuggler's Run. Your entire crew has to press a series of buttons during the pre-launch and strapping in procedure, and then Chewie roars throughout the ride.Right. It would necessitate permanently reinstalling Rex in one of the vehicles. If I recall correctly, Disneyland has 4 vehicles and Disneyworld has 6 (not sure about Japan and Paris). Perhaps having one dedicated vehicle at each park? As for the pre-boarding video, I guess you would simply have to concede that it won't be random and anyone who's boarding that particular vehicle is doing so knowing it's the original experience. I haven't been there in years so I don't remember how the queue ends as you approach the ride but if there was way for riders to branch off in separate directions? One way for the modern version, one way for the retro version if one should desire. Probably not feasible but it would be cool.
I mean who wouldn't love the idea of riding next to a Wookie? (Talking about the pre-boarding video)