Hier ist meine SQL Lösung für die Community. Habe bisher keine SW5 Funktion dafür gefunden:
$art_id= $detail->getId();
$art_id2= $detail_variant1->getId();
$con_id= $configuratorOption->getId();
$con_id2= $configuratorOption2->getId();
// not nice, but seems there is no function for so let's dive in SQL...
$sql = "INSERT INTO s_article_configurator_option_relations (id, article_id, option_id)
VALUES(DEFAULT, ?, ?),
(DEFAULT, ?,?)";
echo("SQL configurator_option_relations: " . $art_id . ", " . $con_id . " ". $art_id2 . " ".$con_id2. "<br>");
Shopware()->Db()->query($sql, array($art_id, $con_id, $art_id2, $con_id2));