The inspiration for such a collaboration comes from a little non-news story about how Damon apparently has a number of imposters around the world impersonating him. Are they clones? Secret twins? Actually Damon on real covert missions for the government a la Confessions of a Dangerous Mind? Whatever they are, they seem to be in as diverse places as Sydney and Miami pretending to be the actor for the benefit of VIP service. Maybe next on their agenda for fraudulence is to star in a Matt Damon movie.
The actor reportedly is aware of and is fine with the imposters, which is why it'd be fun to see him in a reflexive movie that has some fun with these mimics. The best part is Damon, who is extremely busy and very much in demand (if only there were literally more of him to go around!), probably wouldn't even have to appear in much of the movie. One of these supposed doppelgangers can do the majority of the film with Damon merely showing up for a cameo (he does love the cameos).
So let's have it Kaufman. Get working on your next odd look at celebrity with Matt Damon. Unless you're okay with one of your lesser wannabes like Andrew Niccol, Zach Helm or Sophie Barthes taking the idea first.