Just saw this thread. The other day I started working on my own update. On all my Stern's (and friends) I replace the attract mod videos with custom videos. Avengers has 8-9 attract videos for me to play with, so that's great.
I'm also replacing the music with songs from the original soundtracks of the various movies - not just Avengers End Game, or Avengers. So Captain Marvel has her theme from that soundtrack; Black Panther; etc.
I have no plans to replace any in-game content at the moment and certainly not with movie clips because I prefer the comic art. Movie clips look out of place to me when the entire theme is comic based. I'll post videos when I have something to show. Still very early in the project and in the asset gathering and decision phase. Then comes the editing.