That looks like a very cool option and effort. Like the Chinese balloons that overflew the US in the last (few?) years, it would likely be challenging to shoot down. Otoh, it might cause some diplomatic disagreements about overflight.

  There are a number of competing theories in international law, with varying 
  criteria, to delineate the upper limit delineating airspace versus outer 
  space. This debate is unsettled. [0]

0. https://opil.ouplaw.com/display/10.1093/law:epil/97801992316...