Rorschach and John McClane switch places
Everything that happened in their respective cinematic "lives" will happen to the opposite person, though not necessarily in the same manner, and they may very well be killed off early. In this case, Johns family is now Rorschachs foster family whom he regards as innocents. John doesn't wear a mask, but is considered a "superhero". Besides the battles, I want to hear what actually happens to them day to day, minute to minute. 😉