Well, I live in Colorado Springs (over a mile above sea level) and I made it just as directed and it turned out just fine. I know that you are supposed to cut back a bit on yeast and fat and up the flour content a bit in general for higher altitude cooking but in this case it didn't seem to make a bit of difference. I have found that cooking temperatures are a bigger issue. I would recommend bumping up the cooking temperature about 10-15 degrees and cutting back on the cooking time a bit. In my experience the ingredient amounts make less of a difference at altitude than the cooking temps/times. It can take me YEARS (ok exaggerating just a tad) to cook beans/lentils. Ugh. Good luck!
I should say, however, now that I re-read your question, that at 8500 feet above sea level I have no idea.....that's up there with the mountain goats and aspen trees. Things get a bit different at that much of an altitude.
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If no one else jumps in, it might help to compare to a challah recipe designed for high-altitude baking to see what tweaks you might need to make.