Yeah for the easiest way down, you would want to go through Turkey. Roads are very well maintained and borders are quite easy to cross. The quietest border crossing is Malko Tarnovo (just south of Burgas), but if it's too far out of your way, you can just go through the main one at Kapikule and skip the queue (everyone does it on a bike).
Through Russia would also be nice, but you definitely need to get a visa ahead of time and plan your route more carefully.
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