While a driver is not possible, system wide hardware amplification is, which is worthwhile supporting in itself.
I currently use this workaround after connecting the Dragonfly:
1. Start audio playback on max hardware volume in USB Audio Player PRO
2. Exit the app with the backbutton. (Maybe it's necessary to still have running in the background or as service)
Enjoy hearing better audio in any app e.g. when watching a video.
Caveats
It has to be repeated every time the DAC/Amplifier is connected.
The audio is not as good as when playing music from USB Audio Player PRO
Improvement
Automatically amplify the system-wide volume (with a hidden service?) when the hardware is available.
I currently use this workaround after connecting the Dragonfly:
1. Start audio playback on max hardware volume in USB Audio Player PRO
2. Exit the app with the backbutton. (Maybe it's necessary to still have running in the background or as service)
Enjoy hearing better audio in any app e.g. when watching a video.
Caveats
It has to be repeated every time the DAC/Amplifier is connected.
The audio is not as good as when playing music from USB Audio Player PRO
Improvement
Automatically amplify the system-wide volume (with a hidden service?) when the hardware is available.