I did not resolve the entire issue. A mechanic in Calama, Chile adjusted the space between the spark plug heads, fiddled around with my air/gasoline mixture screw and cleaned out my air filter. The idle hiccups dissapeared and the bike performed better at high altitude. Still, at 5000m it could not reach more than 30km an hour uphill and offroad but it worked.
I can't say anything about being able to find fitting jets, I always though most of them are universal.
The jet changing on the other is not so common and most people I met with carbs just keep it how it is. If you suddenly go down a few kilometers you dont want to be running with a lean mixture. Rather have a mixture that is too rich and won't screw up your engine. It is a lot of effort to change the jets and the biggest lesson I've learned on the road is: If your bike runs, don't mess with it. I have run in so much trouble because I wanted my bike to run a bit better that it is just not worth it. But that is my opinion.
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