The real Barbenheimer crossover would be the story of Kitty Oppenheimer, directed by Greta Gerwig. It has EVERYTHING: Communism, picturesque horseback riding, the Spanish Civil war, a Las Vegas divorce, someone falling overboard in the Atlantic and being so awful that nobody misses them, cheating on her husband and giving zero cares about being seen riding around in J. Robert's convertible.

https://en.m.wikipedia.org/wiki/Katherine_Oppenheimer