This is so pointless, why don't you simply harvest 2 hammers for the city with the scout for the rest of the game? Why would I ever want to sacrifice my scout for a single turn +2 production? Not to mention I have to disbanded it on top of my city, I would rather move it further away and harvest trades and productions for the rest of the game.
Can a scout harvest a square in my other cities' city skirt? Can this square count twice toward my productions and trades?