Here’s an idea I haven’t seen. How about having Anakin admit to killing the Sand People to Palpatine while keeping it a secret from Padme?
Actually, that’s an idea I remember seeing suggested. I’ll go with the claim that it was Hal. Funny enough, Palpatine’s original dialog in the duel with Dooku in RotS, which was reduced to that stupid “yeah”, originally had him saying that he remembered Anakin telling him about the Sand People killing his mother, and telling him that Dooku paid them to kill her in order to get him angry and vengeful toward Dooku.