I really feel like klepto is terrible for this game.
I mean farming is so important and when you add a way for certain champions to make a bunch of extra gold in ways other champions cant in a game where items make you so strong and are so important i think your just asking for trouble. Its why other roles arw always looking to abuse support items that extra gold is so important.
If you really want to keep klepto then please reduce the gold on hit and remove gold bags. Let them sell all the stuff they decide not to use in lane. That can be the trade off. Use the items you get for an advantage in lane or save it for extra gold when you back.