Wordpress - Add default menu_order to custom post type, optional terms

gistfile1.php

<?php
// Add to functions.php
// Make sure your custom post type has 'page-attributes' in its supports array
// Adjust the 'typeN's to your custom post types
// the first type
add_filter( 'wp_insert_post_data', 'set_menu_order', 10, 2 );
function set_menu_order( $data, $postarr ) {
	global $post;
	$pt = $data['post_type'];
	
	if ($pt == 'type1') {
		$data['menu_order'] = 1;
	} else if ($pt == 'type2') {
		// this will check and prioritise type2 custom posts with a particular term
		if (has_term('term1', 'tax1', $post)) {
			$data['menu_order'] = 2;
		} else {
			$data['menu_order'] = 3;
		}
	} else {
		$data['menu_order'] = 4;
	}

	return $data;
}

// If you need to apply these attributes retroactively use this to update all your posts
// Remember to remove it after you have run it once.
add_action('init','update_all_products');

function update_all_products(){
	$types = array('type1', 'type2');
	foreach ($types as $type) {
		$my_posts = get_posts( array('post_type' => $type, 'numberposts' => -1 ) );
		foreach ( $my_posts as $my_post ):
			wp_update_post( $my_post );
		endforeach;
	}
}

?>