Remove Klepto, and add a Gold Generation Runes that allow the user to buy special items like...
Heart of Gold, Philosopher's Stone, Avarice Blade, Eleisa's Miracle, Kage's Lucky Pick, Mana potions, Boots Enhancement, Shard of True Ice, Emblem of Valor, Mana Manipulator, etc.
A Keystone that brings gold income and simple utility. Remove the RNG from Klepto and make it more manageable.
the gameplay would be like, Make Money and Spend them on specials items, that offer clear contribution to the team. It would be good for weak early game champion.