Add APU Sound From B757/B777 To All Aircraft With An APU (e.g. B737, A320) Until Individual Sound Packs Are Made

Hello community,

Does anyone else find setting up and aircraft in dead silence except the wind blowing a bit odd? Why not add the APU sound from the 777/757 (is it the same APU sound I can’t tell) so that there’d be some aircraft sound before engine start up not just the sound of the wind. Adding the sound of a 777 APU to non-777 aircraft is a tad unrealistic you may say, but it is surely better than silence. I assume this is possible.
By the way, I’m only talking about the APU, not the engines.

What do you think?

This is not possible as the APU sound is part of the total sound pack. Thanks!