The best Eminem and Kid Rock collaboration already happened. It was called Fuck Off, and it was on Rock's Devil Without a Cause.
Coincidentally, Fuck Off is what most people seem to wish Kid Rock would do.
I still have respect for Eminem for raising not only his own daughter and giving her writing credit on My Dad's Gone Crazy which means she gets royalty checks, but also for raising Kim's other daughters from another man/other men. He really stepped up for those other girls after their dad(s) stepped out. That is worthy of respect.
Recording with a musician who openly supports fascism, I'd like to believe for Eminem, it's all about the music, but now people are gonna wonder if Eminem supports the Epstein class. Not a good look for a guy who went out of his way to raise someone else's kids.