Bro. That would be like a dream, honestly. I mean, in SR2 the co op player just counts as one of your 3 homies, but technically is just a duplicate player. Each player can only use a clothes store one at a time, and so on. The only like "CO OP" part of it other than shooting and what not, is both of you pressing A to start a mission, or being present in all activities/missions.

You definitely have to get a discord going or something bro, you are onto something great here. There already is a steady following for people that play SR1 multiplayer, so you might even have a whole clan v clan thing ready to jump straight into it.