2000 kms oil change??? the oil would be perfect for use right till 5000 kms - replace the oil filter everytime you change oil.
5000 kms air and fuel filter change - where do you drive? and what do you drive on? fuel with grease and twigs in it?
I had a diesel car in Pakistan - air filter was a yearly deal - about 20,000 kms - same with fuel filter unless I poured in fungussy diesel.
oil change Caltex Delo 400 at 5000 kms, even then the oil was pretty slick. Used to pour some in the water suction pump I had at home. Idk about your lifestyle or income or maintenance ideals but all you mentioned is to take your money and light it with a matchstick.