I have no first hand info and while I have bronchiectasis, my sputum were negative for MAC. I grew out pseudonymous putida on 1, but elected to watch.

I did a very quick lit search for . Nocardia seems similar to
MAC in that it’s in environment and most often causes respiratory symptoms as you probably already know.

I found a 2018 study from Julie Steinbrink at U of Michigan comparing immunocompromised and nonimmunocompromized patients with various species of Nocardia. There were 112 patients. Two things stood out to me…dissemination (spread) was more likely in patients with solid organ transplants and “All species except Nocardia caviae, Nocardia nova, and Nocardia cyriacigeorgia, which only caused pulmonary infection, were able to cause disseminated infection.” That would seem to be good news for you. A couple things to keep in mind are that the study was smallish and is already 6 years old and patients were even longer ago. Medicine progresses fairly quickly-also good news for you.
I saw a few more recent studies with smaller sample sizes, one from France and 1 Portugal. They emphasized the need to test for antibiotic sensitivity.
Good luck to you and keep us posted.