This script will allow you to bind a keyboard shortcut to change sound output automatically.
Install instructions:
- Launch Automator
- File > Open and load "Change Sound Output.workflow"
- File > Save to save it as a service
- Launch Preferences > Keyboard > Shortcut
- Scroll Down to "General" section to look for "Change Sound Output" service
- Double click on the space next to the description and press the shortcut keys to bind the script to.