Create Custom Query

Great plugin, I’m wondering if there’s a way to customize the output of the directory plugin.

I’m wanting to group Listings alphabetically by their first alphabet. E.g.

A
Adam Guy
Andrea Swift
B
Betty White
Billy Bob

To pull this off with normal WP posts I would do something like this:

<?php
$args=array(
  'orderby' => 'title',
  'order' => 'ASC',
  'posts_per_page'=>-1,
  'caller_get_posts'=>1
);
$my_query = new WP_Query($args);
if( $my_query->have_posts() ) {
  echo 'Alphabetic index of all ' . count($my_query->posts) . ' posts';
  while ($my_query->have_posts()) : $my_query->the_post();
    $this_char = strtoupper(substr($post->post_title,0,1));
    if ($this_char != $last_char) {
      $last_char = $this_char;
      echo '<h2>'.$last_char.'</h2>';
    } ?>
    <p><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></a></p>
    <?php
  endwhile;
} //if ($my_query)
wp_reset_query();  // Restore global post data stomped by the_post().
?>

So the question is where would I make edits in the plugin for this? And can I do this in a way that’s not overwritten on updates?

Thanks.

https://ww.wp.xz.cn/plugins/connections/