wuzak
Captain
The only value I could see is a ultra high altitude recon platform or a one way high altitude unmanned strategic bomber. Not sure either one would offer more benefit than it costs. I could see Japan using them in place of their balloon bombs to the US/Canada Northwest. I would think 20 tons of small incendiaries dropped at the same time could cause some serious fires in those forests.
How practical would a high altitude air ship be?
The "balloon" section would have to be much bigger, or the payload smaller, to get the air ship to high altitudes.