For those 180 wind shift days, keep an eye on wind indicators all around your flying area - trees, flags, tall grass, smoke, dust, plant seeds or debris floating in the wind, spider webs, etc. If you see a shift ahead of time, you can start heading to the edge of your current window. When the change gets to the kite, you are already half way realigned and you have less pumping and footwork to get the rest of the way around.
If you didn't see the shift coming, and finessing it is too much work, it's easiest to land the kite and walk a 90 degrees arc around the kite while keeping the lines tight (so they don't snag anything on the ground). At that point, you can launch and fly the other 90 degrees around while walking back to the center of your old wind window, if space is limited.
The really frustrating days are when the wind is like a windshield wiper and constantly flip side to side 90 - 180 degrees every three minutes. That's when it's time to get a beer and watch a kite dvd or Oprah, depending on who has control of the remote.