Is it permissible for the Imam of the mosque to supplicate after the Iqamah of the prayer with: "O Allah, Lord of this perfect call, grant our Master Muhammad Al-Wasilah and the high, elevated rank"?

The question of the Wasilah (means) and Fadhilah (virtue) for the Prophet, peace and blessings be upon him, is a Sunnah (recommended practice) after the Adhan and Iqamah. Two matters must be noted: First: The Imam is not obligated to raise his voice with this supplication after the congregants have lined up. Second: The wording of the authentic narration is not as stated in the question. The phrase "al-darajah al-aliyah al-rafiah" (the high, elevated rank) has not been reported in any narration; it is an interpolation and a deviation from the text. Likewise, the word "Sayyidina" (our master) has not been reported in the narration.