A 55-year-old woman with severe ARDS has been ventilated for 14 days. She is being weaned and is currently on PSV 10/PEEP 8, FiO2 0.4. She passes an SBT but after extubation develops increasing work of breathing within 2 hours, with SpO2 falling to 88% on 10 L/min face mask. RR is 32/min. What is the recommended post-extubation respiratory support strategy to prevent reintubation in high-risk patients?