Don’t think if it would make sense, but having it airborne sure would be cool though.^^
Much less issues with the way you’ve designed it.
Maybe windcatcher could be rigged up like this: The most basic airborne wind energy system - #2 by Tom
Or as you say on the downward end of the boom. Would requre swivels and large vanes tough or counterrotating blades.
Also power transfer becomes an issue of course. Would need brushes to prevent torsion of the cable.
You’re probably aware of @Kitewinder https://kitewinder.fr/ a groundgen system. Maybe it could have a more tensile blade structure like the windcatcher.
The advantage would be stronger winds at higher altitudes.