I’ve been using these two little gems (free (donationware)) for quite a while now to quickly switch my sound sources and display resolutions …
SoundSwitch … https://soundswitch.aaflalo.me/
HotKey Resolution Changer … https://funk.eu/hrc/
Sound because I use both headset and speakers and resolution because I have a 4K display and sometimes switch between 3840x2160 and 3200x1800 resolutions.
Just thought I’d put it out there in case anyone else needs trusted utilities like these.