Here are previous discussions about spiriva, which may be helpful to you.
https://connect.mayoclinic.org/group/mac-bronchiectasis/
A pulmonary NP (with not a lot BE experience) put me on spiriva a few years back. I did not last long on it as clearance became very difficult. It was drying. When I switched to a BE centric pulmonologist they quipped that spiriva is effective for those with emphysema and not bronchiectasis. You could always try it and see if it helps you.