Having a go with Sassanids in BI. As a tactic, I am introducing three spies into each settlement in order to induce a revolt for the presiding ERE. Result? ERE Rebels take over (unto whom I am allied). ERE Rebels do hold some of my key objectives so I will have to go to war with them soon. I am not quite done with the ERE, yet so breaking my pact would make matters complex and dangerous for my home defence. Geographically, my flanks are exposed.

So the quuestion is, can I further weaken the ERE Rebels by inducing a further revolt with spies so the settlement is pure rebel?