A 52-year-old man with hypertension and stable angina presents to the cardiology clinic. He has been on amlodipine 5 mg daily for 6 months with suboptimal BP control (148/92 mmHg). His heart rate is 78/min, and ECG shows normal sinus rhythm with no acute changes. Fasting glucose is 126 mg/dL. The cardiologist decides to add a beta blocker. Which agent would be the LEAST appropriate choice in this patient?