@AAllport thanks’ I managed to get set up - after the device was added to HA, I renamed the entities and have been using it with Node-Red to control my office.
So far, Play/Pause, Radio 2, Radio 4, Volume Up, Volume Down, Fan, Shades open, 50%, 75%, and closed and lights.
I was a little dubious about the utility, but this is so much quicker than opening the HA dashboard or using voice commands.
I created an image in Illustrator and print the keycaps from there.
Excellent work.