Go through Plovdiv on your Bulgarian route, should save a few miles.
Macedonia was great, this is what I what I roughly came up with for that goes through Greece.
Yeah, I've not smooth any lumps out of any of these yet, or checked if they're even roads. I have no idea about border crossings, etc. Still, bit better than nothing, right? :S
@hippy started
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Go through Plovdiv on your Bulgarian route, should save a few miles.
Macedonia was great, this is what I what I roughly came up with for that goes through Greece.