Sound interesting! This video has some interesting ideas that would work with some small edits. It’s worth watching,
https://m.youtube.com/watch?v=G7gg00DP8wY&t=1053s

Another idea I had was to move Steve’s voice message to Infinity War, so that the resolution is a bit more connected. If someone can imitate Friday’s AI voice, you could have some clips where Friday tells Tony that there is a voicemail from Steve.
He could ignore it the whole movie, and then you could play it after Peter dies on titan. Just an idea.