How to modify query args for ICS export

I am trying to figure out a way to allow users to subscribe to a specific category of events.

Currently, my goal is to simply generate an .ics file containing the filtered events. I found the following filter hooks, which looked promising:

// File: the-events-calendar/src/Tribe/iCal.php
// Line: 968
protected function get_events_list( $args = [], $query = null ) {
  $args = apply_filters( 'tribe_events_ical_events_list_args', $args );

  $query = apply_filters( 'tribe_events_ical_events_list_query', $query );

..rest of function...
}

However, I cannot figure out any way to trigger them. The get_events_list() function is only called in the get_events_posts() function (same file), but the line(s) that call it are never reached because $this->post is always truthy:

// File: the-events-calendar/src/Tribe/iCal.php
// Line: 369
protected function get_event_posts() {
  if ( $this->post ) {
    return is_array( $this->post ) ? $this->post : [ $this->post ];
  }

...rest of function..
}

I have tried the following URLs, but none have triggered the filters mentioned above:

• https://mysite.com/?post_type=tribe_events&ical=1&eventDisplay=list
• https://mysite.com/?post_type=tribe_events&ical=1
• https://mysite.com/?ical=1
• https://mysite.com/?ical=1&view=test

Can you offer any advice on how to trigger these hooks? Or else, how to modify the output of the ical feed?