Very old thread, but no one mentioned the real bodge: turn it round. Nut off, remove, turn over so the side market out is in and replace using packing as required. There is usually a bit more wear available in the "pushed" face of each tooth hence the final hooked look as the "pulling" side takes more hammer. I've never had to do it on a bike chain, so no idea if it gets you a hundred miles or a thousand.
Given you get a few thousand miles warning, I wonder how you get in this predicament though. I've always fitted new for any trip of even half the chains expected life. You can always use the last 25% of a worn set when you get home.
Andy
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