Bashplate will be essential, as there are plenty of large potholes, very big speed humps you´re not likely to notice in time every time, and in the cities, even open sewer holes, where lids have gone missing. Many opportunities to break something expensive from the engine, unless its protected from underneath.
Crashbars might be a good idea, but you´ll only need them, if you drop the bike. Might happen easily in Asia, though, so I´d probably get them. Centerstand makes it easy to lube the chain & fix/change tyres, but it can get in the way if the going gets real rough, so there´s no one answer, whether you should have it or not.