Rod,
I take fire safety seriously. Kites setting air on fire is a fanciful fear.
Tornados are well known to pick up and set down objects. Oddly enough, I myself was suspended briefly in an F1 tornado at kFarm, as witnessed by Taylor Taylor (“damnest thing I ever saw”). It blew my shoes off, but let me down gently. The idea presented is simply a controllable version of the same basic vortex physics.
According to relativistic physics, a kite does indeed accrue extra mass “at high speed” (not just by ram-air mass). Be careful not to confuse buoyant air “weightlessness” with its mass.