你可以用过滤器theme_page_templates 自出现以来3.9.0 像这样：

function my_theme_page_templates( $page_templates, $this, $post ) {
    $travel_blog_id = 2;
    $blog_id = get_current_blog_id();

    if($blog_id != $travel_blog_id) {
        if(isset($page_templates[\'page-travel.php\'])) {
            unset($page_templates[\'page-travel.php\']);
        }
    }

    return $page_templates;
}
add_filter( \'theme_page_templates\', \'my_theme_page_templates\', 20, 3 );