I think I have the dry MAC you are talking about with the bronchiectasis. I do cough some but don't bring up much mucous so guessing my airways are a bit clogged. Also have some asthma.
My pulmonologist is prescribing inhalers - either Breztri or Stiolto. Just started and don't like some of the side effects - irregular heart beat also little fluttery. I use a device that is a little pipe (stem 2 1/2 inches, bowl 1 3/4 inches) with a ball bearing inside. I breathe in and out into it for about 5 minutes every day and am able to get some mucous up. I like there are no drugs involved and no side effects.