I have bronchiectasis, mild I think, and CT's suggestive of NTM (awaiting culture.) FWIW, Mayo prescribed Albuterol, but not saline for me.
I have a suggestion for your PND and cough. I also had terrible PND and a wretched cough until pulmonary referral for my abnormal CT. He thought the PND was a major contributor to the CT findings and started Azelastine nasal spray and continued my nasal steroids. (The steroid never impressed me.) The Azelastine has truly been a miracle drug for my PND and cough and I can travel and eat out occasionally now. You could ask you doc about Azelastine.
Note: he also put me on Stiolto and Guaifenesin.
Have you had a sinus CT? My frontal sinus shows opacification and Ent has me using Tobradex eye drops into nostril while I have head upside down to try to clear it.
I went to Mayo in March and the chest CT hadn't improved despite the PND improvement. They started Albuterol nebs, Aerobika and postural drainage. They also prescribed their own nasal spray mix, but I haven't switched yet. (Going on trip and didn't want to mess with success.) It sounds like they'll also change the Stiolta to a steroid in future.

Good luck! That coughing wears a body down.
Note this was hard to edit. I just wanted to move a paragraph and kept getting extra ones. 😀