Wa Žalaykum as-salam wa rahmatu'Llah, Some have recommended it. I know Shaykh Abdul Karim Yahya (who has spent many years studying in Tarim) did so. I doubt that this specific Salah is from the Sunnah, but some ulama have allowed such Salawat, including Sayyidina Abdul Qadir al-Jilani, radiya'Allahu anh. Other ulama discouraged that one combine different suwar, repeating a specific amount of times etc, with the fear that it may lead to (or be) bidŽah. wa'Llahu a'lam