With the alarm clock waking the phone from suspend we still need to make sure the alarm sound is audible. We thus need it to have a volume level separate from e.g. media, notifications, calls, etc. This is possible with #wireplumber's "role based policy". There's a lot of lose ends to fix before this all can land but here's a quick demo in #phosh (the alarm sound your is played via #feedbackd which adds the necessary role):
#LinuxMobile