It hasn't really required half as much thought as you seem to have gone to the trouble of, but then photography does sort of take a backseat to travelling and whatever else for a few months at a time for me.
A lot of the stuff I have posted has been for the benefit of people who have not gone through the process of travelling before. You sound like an experienced traveler and if you are anything like me it starts to come naturally after a while on the road. Also I have been shooting a documentary film for the last 6 weeks and also shot work every single day for a month before so I have required a lot more gear than the normal traveler.
In terms of security whilst travelling, I might be over in New Zealand rather than SEA, but regardless of (British thieving blood?) any factors I've had from place to place, I've had all my earthly belongings, which includes a Taylor guitar, laptop, camera gear and some pricey music gizmos, probably collectively valuing about 5 grand... left out in rooms on my bed, or under it, on the bedside table, on the floor, in unlocked dorm rooms of up to 12 people, all day, every day, for the past 18 months, and the only thing I've had stolen was a loaf of bread that I left in the kitchen and forgot about.
You are either very lucky or New Zealand is very safe. S E Asia is no more dangerous or unsafe than the UK but I definitely wouldn't leave my out in the open, unlocked or in a room full of people without being there even at home. Also when I have work to shoot and small freelance jobs along the way I can't afford to loose gear or that's loosing a job/reputation. Despite all this I still wouldn't risk loosing my gear because I don't want the hassle of getting police reports, insurance etc to get my gear back.
Being concerned about
everything is all well and British and although I'm not saying it doesn't happen, it shouldn't really be at the forefront of your mind. Its hard to think of your camera gear getting lost or stolen or broken or probed by aliens, but whilst travelling you kind of get an epiphany about priorities and you understand that as long as you get the shots and get 'em safe, the equipment is replaceable. Criminals, wherever they are, shouldn't change that.
I'm not sure where I have been concerned about 'everything' but surely locking your gear up if you leave it unattended, keeping your essential gear on you and using common sense is hardly going to stop you enjoying travelling. Maybe we have different priorities but when I am spending a few grand going traveling I don't want to have to spend a month of it chasing after insurance to get a replacement D7000 and 12-24 lens if I can help it. I understand your point about priorities, and whilst traveling photography is my priority so looking after my gear is, to me anyway, of utmost importance