I'm sure if you start following the regional forums you should be able to find
out where some other riders are...or where they plan to be.
In Latin America there is a clear "Gringo Trail". Anywhere along this trail you tend to find many RTW riders and foriegners in general, all travelling and stopping at certain "gathering points" along the way.
I can stand on the side of the road in certain places in Mexico and in just 5 or 6 hours see two or three loaded up bikes pass by. Some of short trips, some on long ones.
I'm sure the route out to the middle east, Africa and Asia has these same
"gathering points" for RTW folks. I don't really know your part of the world and
have never been to Turkey. Is there some reason riders are avoiding this area
other than two major wars going on within a few hundred miles?
Watch out for those speed traps in Turkey....I hear they are brutal. Two friends rented bikes there a couple years ago and explored the whole country
for 5 weeks. Lots of traffic fines was the only negative.
Good luck, stay safe!