Worth a shot. But on desert rivers (Deso, Grand), I recall more upstream winds during the day. Local winds blow according to thermal gradients, so they tend to blow from lower/warmer places to higher/cooler ones, i.e. upslope and updrainage. Opposite at night.
My understanding is that a kite, like a spinnaker, is strictly a downwind sail.
Look for a river that flows with the prevailing wind rather than against, and it might be worthwhile.