I think you’re on the right track with a filter. Have you tried login_body_class
as the filter?
function add_blog_id_to_login_page( $classes ) {
$blog_id = get_current_blog_id();
$classes[] = "blog-{$blog_id}";
return $classes;
}
add_filter( 'login_body_class', 'add_blog_id_to_login_page' );
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