I've not been down that way for some years. Actually since the war was still on. The travel through Bosnia is very short on your route.
Depending on what border arrangements there are, you May get stopped, and at that point you MIGHT find they charge you for a months insurance to cross their territory. This is what happened every time I crossed into B&H in both my Landrover and on my 1000S Guzzi. At that time, it was 3rd party cover, and you paid the government insurance agancy. That way, if you killed or injured a citizen, they would get looked after. With luck your cover note will still be valid for any return journey.
Good luck, have fun!
Nick.
p.s. Nearly forgot to add... That coast road is gorgeous! But if it is slightly damp it gets VERY slippery! We used to see the locals pulling cars back up the cliffs nearly every day, and several of the lads got into trouble when the road got damp. Just my tuppence worth.... don't want you to get caught out!