A 28-year-old woman is admitted to the ICU 8 hours after consuming approximately 150 mL of bootleg whiskey contaminated with ethylene glycol. She presents with altered sensorium, severe metabolic acidosis (pH 7.15, HCO₃⁻ 8 mEq/L, anion gap 22), and acute kidney injury (creatinine 2.8 mg/dL). Serum ethylene glycol level is 78 mg/dL. She is intubated for airway protection. What is the most appropriate immediate next step in management?