We could do a monthly event (cycles with new mayor) where the mayor is transporting 5 mil to Sofia from kavala on 'governmental business' in the form of a convoy. This convoy could be protected by the police/blackwater or a detachment from both Working as a joint security force. The aim for rebels would be to capture the mayor/mayor's vehicle and therefore gain the money in the vehicle. It could work as in if you capture just the vehicle you get 3 mil and if you capture the mayor alive and the vehicle it's 5 mil. This is just a base idea and very much open to being expanded upon.
Wrote this on no sleep, no bully.