I cannot comment on what are the most common 125ccs in Eastern Europe and Africa but I have have the direct comparison between riding a 125cc (Honda Scooter) and a 500 cc (Suzuki GS500E) because I happen to own both of these rides.
If high speed is not crucial and you have a GPS to follow the routes off the motorway by all means go with the 125cc. I have done almost identical trips on both of my rides (400 km´s around most of the Black Forest in one day). By the end of the day my scooter was more fun and way less exhausting to ride. The GS 500E (to me) has it´s huge advantage only in being highway capable. OK, it is also a cooler ride and I can wring her if I feel like it.
As far as luggage is concerned, the 125 cc will give you ample opportunity to carry gear, no problem in this department.
The Honda XR125 might be something to look for as well. It is closely related to the CG125.
I am partial to EFI, so the Yamaha YBR 125 in the "G"-configuration would be cool for me. Also the Honda 125CC Varadero, but this is probably not the simplicistic ride you have been asking about.
Whatever you do, happy trails and good luck!
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