I agree with Peter-Denmark. Most upgrades are unnecessary.
Lever guards, soft luggage (though I just did a trip through the Middle East with my KLR and I used Givi Plastic luggage... I liked that!), a reusable oil filter is a good idea.
I, too, brought an aluminum crutch with me in place of a center stand. I made no modifications to it. I've tried to attach a picture of the stand in action, but I'm no computer whiz. I hope it works. (This photo is of a road side tire shop in Beirut. The jack is under the bike as a backup. The cane is holding the weight.)
I have all sorts of pictures of my Middle East trip on my website if you're interested in seeing how I set up my KLR for that journey.
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