I'm not a believer in rotating tires, but it might make sense in your situation.
One consideration might be that the wear pattern of rear tires is different than front, and it can affect handling. So if you're going to rotate, do so early on, say at 1,500km.
Depending on where you're traveling, you might consider staging a replacement tire someplace along the way. Or, as I did when traveling where I might not find spares, arrange with somebody to be available to buy and ship emergency items to you en route.
Also, 4000kms isn't beyond the predicted service life of a rear tire. I ride tubulars and have gone much farther on my rears.
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Last edited by FBinNY; 03-20-16 at 06:37 AM.