A 68-year-old woman with a 20 pack-year smoking history presents with hoarseness for 2 months. Laryngoscopy reveals a left vocal cord in the paramedian position with a bulky left supraglottic mass. CT chest shows a 4 cm left laryngeal mass with left RLN involvement and no distant metastases. After staging, she is deemed suitable for curative intent treatment. What is the most appropriate next step?