Could this be a possible, and somewhat unrelated, sequel for that previous Abdellatif Kechiche film? I think it either can or can’t be, but having thought about that ‘violence’ part, either Lars von Trier or David Lynch could be a perfect handler for this plot though. You decide the alternatives.
Coincidentally, I had just completed a fiction work with an almost similar theme, this time about a single-mom prostitute and her three children.
Or make it like this: he used to be a millionaire, but ended up poor for his addiction to gambling and drugs throughout the Great Depression. Somehow, unexpectedly, after NAZI rose to power, and persecution of German Jews began, he became a hero, though after the World War II, he met his own tragic ending. You could decide how his life would end, whether he was deported to Siberia or to arid desert in Central Asia. You choose.