Would it be possible to create a folder action that can push timed Notifications?
Enable at:

sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.atrun.plist


Add a Run Shell Script action that uses terminal-notifier to display a notification:

at 2 months &lt;&lt;&lt; 'terminal-notifier -message "some message" -title "title"'


Replace terminal-notifier with /Applications/terminal-notifier.app/Contents/MacOS/terminal-notifier if you've installed it by downloading the application bundle.

now+5 &lt;&lt;&lt; 'say a' would run a command in five seconds. You can list scheduled commands with atq and remove them with atrm. See man at for more information.