Disabling a specific system notification?
Have you tried...


  This applescript will close them for you. Paste it into Script Editor
  and then Save as an application. Then grant access to that application
  in (System Preferences > Security &amp; Privacy > Accessibility) Then you
  can use an application like ControlPlane
  https://www.controlplaneapp.com/ to run the application on wake thus
  closing them all automatically! ** Note: You will need to grant
  Accessibility access to ControlPlane as well.


tell application "System Events"
tell process "NotificationCenter"
    set numwins to (count windows)
    repeat with i from numwins to 1 by -1
        tell window i
            set temp to value of static text 1
        end tell
        if temp contains "USB Accessories Disabled" then
            click button "Close" of window i
        end if
    end repeat
end tell
end tell


From How do I disable this message: &quot;the disk was not ejected properly&quot;?

This will need some tweaking to close the window you are looking for maybe a cron job or something similar but it might be a step in the right direction.