Well the good thing is that you wouldn't have to SHOW Piett or even another officer saying anything. You could have someone who can do a good "Piett (don't know the actor's name)" and have a voice over a TIE cockpit scene per the order to guide the Falcon to the reactor (with the expected "what?!?!" from the pilot, though if the Emperor was mad enough to start wiping out everyone in his path, I don't think the fleet would be TOO far from agreeing with such an order if it was the only way to survive).

Similarly, you could dub in extra/alternate lines when Piett (or anyone) has his back to us.

My angle is along the lines of QUO VADIS and how even the Praetorian Guard turn against Nero when everyone realized he was the one who set Rome ablaze, not the Christians. Also keep in mind the general mindset of the German army as compared to the SS - a good point of reference would be the scene in THE KEEP between Jurgen Prochnow and Gabriel Byrne: I would want to see an end that would truly be a relatively happy one. Simply killing the Emperor does NOT stop the Empire, but if you had in essence the next in command making a truce after all the crap they took from Palps just to see a lot of your friends get killed... well that would settle things quite nicely.

PS: even before the Prequels, I always wished they had Chris Lee in JEDI as a imperial general plotting to take out the Emperor ala the Valkerie plot. Maybe it would have been too much to add to what was already there, but if there was one STAR WARS movie that damn near needed to be LORD OF THE RINGS EXTENDED VERSION long, it was JEDI.

Vaderios:
we shall see what Ady has in store. Maybe he is double jiving us, maybe not. Like he said in a much earlier post, he always wanted to see Lando do an INDEPENDENCE DAY to the reactor ... until INDEPENDENCE DAY did it. I still wouldn't mind seeing Lando sacrifice himself, but again I can go either way - I like the YAHOO too.

Even so, there are going to be some radical changes just due to the fact that he plans on remaking half to most of the battle footage, so you never know. JEDI: REVISITED is a looong way away, so anything can change from here to there.