I've found an airway clearance routine that works for me by relying on knowledge of my body and breath control, combining conventional airway clearance with yoga breathing techniques.
To Prepare for Psychedelic Therapy, Doctors Breathe Their Way to an Altered State - The New York Times
Peripheral Airway Clearance Techniques - Education by Breas
Airway Clearance Techniques
Airway Clearance Devices for Managing Lung Disease
91: Clear the Air on Airway Clearance - The Curbsiders
Airway clearance for bronchiectasis
Qatar Airways Unveils Big U.S. and Global Expansion Plans - AFAR
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How Wheezing Is Treated