I don't know enough about the countries on your route to advise on fuel station frequency, but generally the poorer the country, the less fuel the locals can afford to stick in the tank, and the more frequent the stations need to be.
Although the 1200GS comes in for a lot of bashing it's still quite a remarkable beast. The early models are not so massively heavy for what it can do, and it is particularly well suited for two-up touring with loads of luggage, however fuel economy of 19-20 kpl is NOT its strong point.
You would be better off with a F650GS twin or F700GS which bumbling along two up at 70-75 kph should be getting 23-24 kpl which would be quite a financial saving over 40,000 km. Some real world comparisons (post 32 on the thread): ► Fuel efficiency, range and octane questions
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"For sheer delight there is nothing like altitude; it gives one the thrill of adventure
and enlarges the world in which you live," Irving Mather (1892-1966)
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