Is there any way to

In your child theme, create a file called comments.php with the following content:

<?php
/**
 * The template for displaying comments in a Customizr child theme.
 * Modified to show the comments before the comment form.
 */
?>
<?php if ( have_comments() ) : ?>

	<?php echo apply_filters( 'comment_separator', '<hr class="featurette-divider '.current_filter().'">' ); ?>

<?php endif; ?>

<div id="comments" class="comments-area">

	<?php if ( have_comments() ) : ?>

		<?php do_action ( '__comment' );?>

	<?php endif; // have_comments() ?>

	<?php
	$args = array(
	  'title_reply'       => __( 'Leave a Comment' , 'customizr' ),
	);

	comment_form($args); 

	?>

</div><!-- #comments .comments-area -->

This is a copy of the theme’s comments.php, with re-ordering of the comments/form. It will take precedence over the parent theme’s file.

It’s Customizr’s comments.php that you’re overriding, not WordPress’s. It’s in the main folder of the Customizr theme (in wp-content/themes/customizr).

I simply shifted this:

<?php if ( have_comments() ) : ?>

		<?php do_action ( '__comment' );?>

	<?php endif; // have_comments() ?>

above this:

<?php
	$args = array(
	  'title_reply'       => __( 'Leave a Comment' , 'customizr' ),
	);

	comment_form($args); 

	?>

rather than below it.

I will now re-examine WP’s comments.php

You don’t need to. It’s Customizr’s comments.php that I got the code from.