Sorry, I know nothing about shipping on that route,
just been following the forum, because I´ll probably need to ship back from SE Asia to Europe after my trip... and $1100usd for airfreight, between continents, actually sounds very cheap!
If its only ~500usd between the boat and the plane, Id be very happy to pay that to get it freighted in a few days instead of several weeks. Maybe handling customs at the airport is smoother, too.
So far Ive been offered around 1000-1200 euro from Thailand to Belgium or Germany on a ship... its a 10 hour flight, so distances should be roughly in the same ballpark as yours. Seems like its well worth to go asking around for airfreight, too.