Okay okay, here me out. Stardust Crusaders in Vietnam. I know what you're gonna say.

"What drugs are you on"

I am well aware that I seem crazy, but think about it. SDC takes place in like the 1960's right? So theoretically if they all did survive in an alternative timeline, I don't think it would be a stretch to say that Joseph could've rallied the gang back together to fight the communists and protect the poor southern vietnamese against their evil communist northern counterparts.