Also if you want to get a clip of James Earl Jones saying "Your Mother..." Look no further than CD set of him Reading The New Testement of the bible. He says that at least twice on the cd set You might be able to put it with his ROTJ conversation with Luke. Luke says "Come with me" as Padme also said, then Vader repies "Obi-Wan once thought as you do." Which could be changed to "Your mother once thought as you do." Which seems to fit better.
but if you look at Revenge of The Sith it's clear that Obi-Wan makes much more of an effort to bring 'back' Anakin to the light, than Padme does, she barely even has a chance before Vader chokes her , and her trip to Mustafar she seemed to be on a mission to warn Anakin and was more in 'denial' than anything else.
your suggestion kind of works if you're viewing all 6 movies in order, but doesn't make much sense if you're viewing the original trilogy as a whole. and I'm not much in favour of changing the originals to fit in with the prequals, it's a dangerous area to tread.