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/**
 * WP管理画面上部のホームURLの変更
 */
function change_homeurl() {
    ?>
    <script>
        jQuery(function ($) {

            const $element = $("li#wp-admin-bar-site-name a");

            for (let i=0; i < $element.length; i++ ){
                const homeUrl = $element[i].getAttribute('href');
                $element[i].href = homeUrl+"example.com";
            }
        });
    </script>
    <?php
}

add_action('admin_print_footer_scripts', 'change_homeurl');