Replacing FullCalendar View with FullCalendar Block for 'Page' Views

A quick thought in my mind is that,

You can create a content type in which you want the calendar is displayed, for instance, a content type called "Calendar".

This content type only need the tile and body filed.

Then you can create a new node of that content type. At this point, you will get a page of that node with the URL(page alia) you want.

In the block setting, specify the visibility to limit only that page (URL) this block can show up.

https://www.drupal.org/docs/core-modules-and-themes/core-modules/block-m... →

In terms of replicating between themes, you probably has to manually do that for each theme. Maybe there is another better way to do that.