How to Move the Comments Bubble to the Right Side of the Toolbar

After you have removed the comments bubble, you add it again. The trick is that in the $args of add_node you have to set parent to top-secondary.

So it will look like this:

add_action( 'admin_bar_menu', 'wpse227079_toolbar_link_to_bubble', 999 );

    function wpse227079_toolbar_link_to_bubble ( $wp_admin_bar ) {
        $args = array(
            'id'    => 'wp-admin-bar-comments',
            'parent'=> 'top-secondary',
            'title' => 'QQ',
            'href'  => 'QQ',
            'meta'  => array( 'class' => 'QQ' )
        );
        $wp_admin_bar->add_node( $args );
    }

Title needs the full html of the bubble, href the link where it is going and meta the class for the list item. You’ll have to delve into the source code of the admin bar to find the right QQ’s for the bubble.