There is another approach.....
I work for a US company, and we plebs in the UK have to travel to the states a lot. A certain airport in the US is pretty bad at handling luggage, and there is a suspiciuos amount of "missing" luggage as well.
A number of us have purchased starter pistols. These are entirely, 100% legal to own in the UK, and you don't require a fire arms certificate or anything like that. JUST the starter pistol - no ammunition.
Take it with you to the airport. When you check in, declare it. Ideally ( just to save time ) declare it before hand, when you do your online check-in.
You get given a nice steel padded box with some very secure locks on it. Into this you place your starter pistol - along with anything else you want. We often put documents, expensive bits of equipment in there or small laptops. There is plenty of room for a camera and a couple of lenses - even sizable ones.
The box is looked after extremely well - it is tracked all the way through it's journey, it is stored away from the normal luggage so it doesn't get bumped, and generally seems to be treated with kid gloves.
When you get to your destination, you sign a bit of paper, and they open the box up for you.
Now - I'm not sure if this would work for every country - I would check before I tried it in china for example, but it's now something that a lot of us do every time we fly.