Ok..I reckon a little w650 kawasaki would be quite a cool bike to travel on. But I would keep it stock. They are pretty reliable from all accounts. You may want to put some chunky tyres on it to better handle dirt roads.
You will need the battery for things other than the starter!..lights, ignition indicators etc. I wouldnt try to make things harder than they have to be. You will find that the w has an alternator not a magneto so requires a battery.
Close to Antarctica and a long way from reality