A 12‑year‑old male with a known history of congenital methemoglobinemia presents for bilateral inferior alveolar nerve blocks to facilitate extraction of multiple impacted molars. He has no prior anesthetic history and is otherwise healthy. His preoperative hemoglobin is 14.6 g/dL, and his baseline methemoglobin level ranges from 2 % to 14 %. Which of the following is the most appropriate anesthetic management strategy for this patient?