Modify Registered Custom Post Types Args

cpt_registered_mod.php

/**
 * Filter the Products CPT to register more options.
 *
 * @param $args       array    The original CPT args.
 * @param $post_type  string   The CPT slug.
 *
 * @return array
 */
function custom_permalink_mod( $args, $post_type ) {
	// If not CPT, bail.
	if ( 'registered-post-type' !== $post_type ) {
		return $args;
	}
	// Add additional CPT options.
	$custom_args = array(
    'rewrite' => array(
        'slug' => 'post-type-slug',
        'with_front' => false,
    )
	);
	// Merge args together.
	return array_merge( $args, $custom_args );
}
add_filter( 'register_post_type_args', 'custom_permalink_mod', 10, 2 );