You may be able to find an alternate clock app or alarm app that will allow you to set an alarm every other week, but my cursory search hasn't found any. My suggestion would be to use the reminder app, set it to remind you at the specified time every other week, and set the notification sound to something loud and long - perhaps a song, or your normal alarm sound; and set the sound to "strong". Setting the app sound will cause all reminders to have that sound, you cannot change the sound for individual reminders. This will work if that alarm is the only reminder you set. You can also set repeat notification alerts for individual apps (set the reminder app) and set the repeat interval, that way if you miss it the first time, you will hear it the next. Make sure you allow the reminder app as an exception in do not disturb or the dnd parameter in sleep mode - whichever you use at night.
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