You can wire the encoders straight to the i/o pins on the pi. Indeed back when the earth cooled that was how it was done. We’ve documented several of these …
and the webconf set up effortlessly supports it all ( Once you’ve worked your way through the mapping … There’s a chart out there )
If bare metal engineering isn’t quite your thing then
The AllinOne board his what I would use, and just ignore the MIDI bits…
It’s really much more about how you are going to mount things and the type of enclosure you are going to use., and it the pi world that means you are really worrying about how to get access to the Power connectors, the usb, ethernet & the SSD especially if you’ve bolted your pi directly to the back of the touchscreen.
