So I already envisaged the use of kite trains. But also the PV orientation face to the sun can to not match that of the kites in regard to the wind. Things would perhaps be easier by using Isotropic kite.
Only at low altitude (and even I am not sure) because solar tethered balloons are large and offer a lot surface to the wind, leading them to lose their thrust by convection and to lie down.There is little possibility for some additional kite to mitigate this effect.
As I mentioned the solar thermal part is also ensured by the black e-film, in addition to provide electricity (about 100 W / m²).
Solar thermal balloons are better when they are untethered.