Calendar.app: disable event-specific alerts while retaining calendar-wide alerts

I would like to essentially move all of my calendar alerts to appear 5 minutes before the event, rather than the time chosen by the event creator (typically 10 minutes). Is there a way to achieve this with Calendar.app? I can configure an extra alert in this menu for 5 minutes before: However, the event-specific alert is still shown. Selecting 'Ignore alerts' in the calendar info will ignore all alerts, even the configured 5 minute alerts in the settings panel: How can I receive only a 5 minute alert for all events?