While you can't put Hank Pym's wifebeating back in the bottle, you could essentially erase the story in any number of ways, giving Marvel plausible deniability i.e. "the Hank Pym who hit his wife was an extradimensional doppleganger (just as an example), and not the character who was a Marvel mainstay for 30 years before that incident." No more outlandish than One More Day, is it?