I haven't heard of it being tried, but there may be someone out there who knows.
Keep in mind Trikafta (elexacaftor + tezacaftor + ivacaftor) is a gene modifier, targeted to a specific genetic mutations in CF patients. CF is not generally present in Bronchiectasis, although some people here have some CF genetic markers.
It is not an antibiotic, so it will not cure infection. It is not a mucolytic, so it will not thin secretions on its own absent CF gene mutations.
The best place to find out about any trials would be to contact the manufacturer.
Sue