Bribery?

I've seen name of top-tier diplomatic units in the Game Tour section that have not beem implemented(human Highlords, etc). I know the dev team is planning on doing something with them, but I'd like to suggest that they be used for something like bribing enemy units. It would work that they are sent to an enemy city, pay their troops, commanders, or diplomatic units with gold for them to defect or disband(effectively killing them).

I figure this should be focused on attacking diplomatic units, since right now the only way to get rid of them is to wait for them to fail or trip a Rune, and there's already ways to deal with enemy commanders and troops(assassins, bigger armies).