I would stretch the oil change intervals to 10000 km and change the filter only every other time. Modern oils (even cheap ones) and modern engines are so much better these days. I will not carry an air filter, either: it can be cleaned sufficiently well with compressed air. I use the saved space to carry things that are more likely to break, like a clutch cable, brake pads, etc.
If you learn how to adjust valve clearances yourself you will be able to service your bike yourself and learn something about it, which will come in usefull when it breaks down and there is no mechanic around.
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