maybe too radical, and i dont know why or how this could be done, but maybe somehow leia could have it, and she could give it to luke to where, repeating anakin's line from TPM 'it will bring you luck' (i think he says that.:P)
i am assuming that ROTS:R wont have padme dying, to fit in with her surviving until leia is young enough to remember her, and thus perhaps give it to her.