Disable backup alarm for choosen alarms

Use case:
Before main alarm goes off, I have a pre-alarm - very quiet, calm nature sounds alarm, which purpose is just to shift me from deep sleep into shallow sleep, but not wake me up.

Half hour later my main alarm goes off to wake me up.

I would like to be able to set-up backup alarm only for my main-alarm and not have it for pre-alarm.

Current situation:

  • if I set backup alarm it will also wake me up just after my quiet pre-alarm (as it is not intended to be interacted with)
  • if I do not set backup alarm, I do not have certainity I will wake up after main alarm

BTW. This is my way to trying to implement this behavior Pre-wakeup noises before alarm