Actually, I think I’ve come up with a more elegant idea than altitude-triggered airbraking. There is no requirement that when released they go down into the gravity well :-D
Your two objects are leaky zeppelins.
Helium Zeppelins aren’t exactly rigid bodies. But vacuum Zeppelins are. Those could be arranged to do the job.
Actually, I think I’ve come up with a more elegant idea than altitude-triggered airbraking. There is no requirement that when released they go down into the gravity well :-D
Your two objects are leaky zeppelins.
Helium Zeppelins aren’t exactly rigid bodies. But vacuum Zeppelins are. Those could be arranged to do the job.