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I knocked up a simple shortcut which gets triggered on any alarm. It reduces the new alarm/timer volume to something very low, then ramps the volume up over a minute. Obviously, you can adjust the numbers as you wish. It seems to work well.

My screenshot came from my laptop which hides what isn't possible on MacOS, so remember to change that volume action so it selects the "Alarms & Timers" one.

alarm vol.png
 
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