vaderios said:

And all these might work on an other edit.

Ady will not change any of these for any of the reasons you mention.

You can continue the interesting dicussion at ESB and ROTJ wishlist topic.

-Angel

But, if I understand correctly, there isn't really anything to change. Vader wanted Luke to kill the Emperor so Vader could become the new emperor, Luke would become his new apprentice and they would then "rule the galaxy as father and son". The Emperor wanted Luke to kill Vader and become his new stronger, younger apprentice- "now, fulfill you destiny and take your fathers place at my side". That was all already there.