Possibly but the majority of the changes would be in the PT and it's far less convoluted than Qui-gon, a character who only appears in TPM being the basis for a major plot development in the whole saga only vaguely being mentioned in the last five minutes of Episode III.
You needn't even show Leia seeing her ghost in ROTJ it could be something that manifests after Leia gets her training making Padme's ghost a PT exclusive only mentioned via an edited line of dialogue in Episode VI.