Trying to wrap my head around the cloning idea. Can honestly say, I did not see that coming at all.
Technically, cloning is "the ability to create life". Perhaps this could be what Palpatine tells Anakin in RotS, in a way that manipulate him without ever truly lying. And if, as many believe, Anakin is the product of "creating life" then perhaps Anakin is actually a clone of Palpatine...
Finding some old footage of McDiarmid, and implementing it as the Ghost of Anakin would tie that up rather nicely in Jedi ;)