Sitting here grinning at memories due to the picture of your sprocket! Only once have I ever seen one as worn at that one was when I was working for a Yamaha/Kawasaki Shop and two German guys pulled in on KLRs. One had his chain adjusted as tight as he could just to get to us. As usual, parts had none in stock. I had a '92 KLR at the time , same as his was, so pulled the sprockets off my bike to get him down the road.
Keep it coming, love reading about the trip.