You are much better off if you ship the keyboard in it's orriginal carton via UPS to the destination ahead of time. It is less expensive, it can be insured, they are a responsible company, it can be tracked from any computer, and they will have it there when they say they will. Put in on a plane and there is no insurance that it will not be destroyed by baggage handlers who could care less about your equipment, and if it's lost, the airline could care less. As far as they're concerned, whether it's lost baggage or a lost keyboard--that's your problem.
When you're finished playing the keyboard, pack it back into the same box or hard-case, take it to UPS and send it home. I know of several traveling musicians who have used this method of transportation for years and said it's the safest, least-expensive way to send your equipment anywhere in the world.
Good Luck,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)