I think, the easiest solution is your case would be set it as you like, and back it up.
For this purpose I have made
two script solutions for you.
First is a SIMPLE.BAT
As it's name goes it simply dumps settings related to your tray notifications into a single REG file with no questions asked (at least when it runs as Admin). When script is done, you can find your
Tray_notify.reg in
C:\REGBackup. If that file already exists(from previous run of the script) it asks you to rewrite it or not (y/n).
To restore settings you just need to run that backup file
Tray_notify.reg and Log-off or Restart or Restart Explorer.exe
Second is a more advanced script REG_BACK_UP.bat , it creates subfolder with time stamp in
C:\REGBackup and places
Tray_notify.reg there. Time stamp is European 24-hour format (judging by your time zone

) plus it has a random number at the end, so you can run it every second of the same minute and every time it will create another folder. And then script dumps
Tray_notify.reg in than folder too.
To automate process of starting the script at desired time
Task Scheduler can also be used if required.

Script has comments inside for modificational / educational purposes. Folder
C:\REGBackup can be changed also (

carefull with quotes).