Tracheal Stenosis Variable Intrathoracic Obstruction Flow-Volume Loop

A 45-year-old man presents with progressive dyspnea on exertion and stridor 3 weeks after prolonged mechanical ventilation for sepsis-induced ARDS. A flow-volume loop is obtained, which shows a flattened expiratory limb with a preserved inspiratory limb, as marked **C** in the diagram. Fiberoptic bronchoscopy confirms a 0.8 cm weblike stenosis at the mid-trachea. Which of the following is the most appropriate first-line management for this patient?