Was Peter Parker still recruited in this timeline? He's around the right age for the initiative
Also, I would be interested to see Cap's reasons for signing the Accords this time around
He had probably already been contacted by Tony Stark, but didn't get to interact with the other Avengers. If you're interested in playing as Peter, you can try revamping the character's story. As for the fact that Captain signed the treaty, I will probably develop the plot around a last request from Peggy Carter on her deathbed.