My thought was simpler. Have covers for the cushions on the seats, and thermal blankets and pillow in storage.
Bust them out when needed. Have a priority list with number tags you put by your spot. When hotel space opens up they quietly wake you and take you to the hotel to start the clock for true crew rest.
I'm thinking it would be possible to arrange, in advance, for airport hotel conference rooms to be turned into severe IRROPS lodging. (In another place and time, I frequented an IAH airport hotel that was equipped for something like that--but they were thinking hurricane evacuations).
Might even be better than the crash pads long-retired FA friends had in NYC. (Which were nothing more than one of several bunks in a shared room, a bit of lockable drawer space, and a shared bath). They were closer to a barracks than a good hotel.