A 58-year-old male with a 40 pack-year smoking history presents with progressive dyspnea and stridor over 3 weeks. Flexible laryngoscopy reveals a 2 cm subglottic mass causing 70% airway narrowing. Biopsy confirms squamous cell carcinoma. The patient is scheduled for total laryngectomy with adjuvant radiotherapy. Before induction of anesthesia, which of the following is the most appropriate immediate airway management?