You attend a 24-year-old male who is acutely agitated, aggressive, and paranoid following ingestion of synthetic cathinones (bath salts) at a nightclub. He is hyperthermic (39.5°C), tachycardic (155 bpm), and hypertensive (185/110 mmHg). He is a danger to himself and others. The new JRCALC 2025 Behavioural Emergencies guideline applies. What is the most appropriate pharmacological intervention?