Specifying a calendar when importing an ICS file into Outlook?

This shouldn’t be that hard, but, it’s Microsoft, so ... I built a little tool that automatically calculates litigation deadlines based on a set of rules I coded based on the California Code of Civil procedure. In Firefox and Safari and probably others (but not Edge or MSIE, sigh), it also, in JavaScript, builds on the fly .ics files for easy importation into your calendar app of choice.


When that file gets opened on the Mac (using Calendar.app), quite sensibly the user is prompted as to which calendar the event should be added to:

But ... Not on Outlook. In both the Outlook 2010 and 2016 desktop applications, the iCalendar file gets automatically opened by Outlook:

Outlook populates a window with the event information, but does not provide any option to specify which calendar the event should be added to:

When the event gets saved, it’s created on the user’s personal calendar, and has to be manually dragged and dropped onto the shared calendar used throughout the company - not ideal!

There should be a way to specify what calendar to add the event to, or a way to set the default calendar to which imported iCalendar events are added ... no? My Microsoft-fu is (somewhat intentionally) rusty...