Joe, maybe you can help me think this out a bit more
I got a Pi Zero W with the idea of using it with that keyboard extension to control Roon with the Ortho Remote without the need and for and complexity of a whole Windows PC with Autohotkey.
Now, dietpi runs just fine on the Pi Zero W – WLAN and all that is okay. Bluetooth also okay. Installing the roon-extension-keyboard-remote also okay. But here it ends - the Roon keyboard extension has to run on an endpoint with, as the Github page explains, a Roon bridge. And Roon bridge is available for ARM 7 and 8, a Pi Zero however is most sadly ARM 6.
I have a RPi 3B+ with Ropieee on it. I think then, probably that needs to be replaced with Dietpi and a manual Bridge install, and then the keyboard extension can go in there.
Is that what you have running to make use of your Ortho Remotes?