SearchWP sort results by last word in title

functions.php

<?php

// SEARCHWP - RETURN RESULTS ALPHABETICALLY
// ===================================================
function my_searchwp_query_select_inject() {
	global $wpdb;

	// SELECT the last name as computed by MySQL
	return "SUBSTRING_INDEX({$wpdb->prefix}posts.post_title, ' ', -1) as lname";
}

add_filter( 'searchwp_query_select_inject', 'my_searchwp_query_select_inject' );

function my_searchwp_query_orderby( $sql, $engine ) {
	global $wpdb;

	return "ORDER BY lname ASC";
}

add_filter( 'searchwp_query_orderby', 'my_searchwp_query_orderby', 10, 2 );