The Fett scene would be difficult, but not impossible. It would probably be do-able in a decent 3D program if it's made a bit more subtle to disguise the fact that it's CG. Killing off Fett would not work since it pretty much ruins everything EU. I know that not all EU is considered canon, but by now there are some facts that are agreed on. Fett survives, Han and Leia have Jacen, Jaina and Anakin, Luke sets up a Jedi temple on Yavin etc. But doing something simple and subtle, like a hand coming out of the Sarlacc, would work.