In the "Revenge Of The Jedi" draught script every hit of Force lightning that Palpatine chucked at Luke was deflected as a flash of Obi-Wan and Yoda's ghosts flashed in it path.

While I'm not suggesting that it might be effective if instead of getting a full flashback positive figures from Anakin's past appeared before him in rapid succession (almost subliminally) ending with Padme to create the impression of the Anakin side of Vader's persona rebuilding itself.

Good memories rather than bad ones would kill Vader and set Anakin free.