Nice little bike!
Have you seen the bike in person? Look on the steering head where the metal VIN sticker is. VIN sticker should say MADE IN ... where ever.
I don't know this specific version of the 125 .. but do remember how solid the original 125's were back when they were imported into the USA. (70's and 80's) (They were nearly identical in their look to the one you've shown)
A girl friend rode her 125 to Uni for 4 years. She loved that bike ... it never missed a beat beyond a dead battery. Everything on it lasted forever.
Regards more recent Brazilian made Hondas: Honda have been in Brazil over 10 years. CRF150 and CRF230 are both made in Brazil and quality has been very good. (we get these bikes in USA since mid 2000's) I'm sure Honda make a variety of bikes in Brazil for various markets worldwide. (including to re-import to Japan!)
A good riding buddy has the air cooled CRF230, I've serviced it for him and done mods. Solid bike that is ridden hard and beaten riding off road! It's been perfect, no issues! (and responds well to careful fettling)
Others have their kids racing the Brazilian made CRF150 and have a ball racing Flat Track on them. Great way to learn to ride/race. They even bore them out and hot rod them. No issues I've heard about. Anvils.
If you are sure that is the bike for you for travel ... I'd buy one and start riding it round. Take it on a few longish test rides loaded up. If it does not work out ... sell it off and buy something else. Honda's aren't too hard to re-sell.
If me, I'd go with at least a 250cc bike ... and go with an enduro model for lightness and strength. Not a big difference in weight (125 vs 250) but the 250 will do highway in a more relaxed manner and maintain a higher (safer) speed and still be economical on fuel.
The 250 will haul a bigger load and face strong head winds better as well.
Once up over 4000 meters the 250 may just make it up and over ... the 125 ? Dunno?
Nate the Postman really struggled in India and Nepal over the high passes on his little 100cc Postie bike. (not much fun for me ... as I rode Honda 50's and Honda 90's from age 13 until 18. I know them very well!)