SwitchAudioSource currently has a few bugs that prevent it from listing and selecting Airplay devices... which could render it useless for many use cases (including myself).
Both physical and AirPlay (i.e., network) devices are listed in the Sound Output section of Settings (MacOS 26.2), as well as on the Menu Bar sound icon in the upper right of the desktop.
Would it be possible to enable the SwitchAudio app to list and select both physical and AirPlay speakers?