Would it be fine if...
The new yellow gold income item that has supports collecting coins? Not sure if it's still called Ancient Coin. Anyway, When I first was playing support and also now when I'm the bottom lane ally of his I wonder: Why not let the support share the blue coins with his lane partner?
Would the extra mana for your lane partner be too much or would it be fine? I mean, whoever picks it up first gets the coin. However, the distance for the lane partner to pick up the coin should be about half the distance so they don't accidentally take it as much. Obviously, it wouldn't work very good with melee lane partners because then they'd be taking your coins all the time I guess.