I have noted that similar fares are available out of Egypt's other airports namely Alexandria or Luxor.

Has anyone tried to do a turnaround to any of these airports.

Logic suggests that these airports are smaller than CAI - i.e not multiple
terminals, buses transfers etc. - and therefor easier to tarnsit/turaround?

I presume the same applies - that you can do online check-in , but not print/get your boarding passes beforehand.