Or perhaps something where when you damage a structure, you gain a hidden stack of "Tower Destruction" per damage dealt, and when you or an ally destroys a structure, you claim a base bounty, and then all Tower Destruction stacks each player has are consumed for gold per some percentage of the stacks. This could replace First Blood Turret to incentivize just pressuring all turrets instead of a single turret.
On that note, perhaps making Ohmwrecker work with this (automatically give stacks for every use) to make it just a bit more lucrative for Supports, who will have a tougher time getting stacks otherwise.