Faderport goes with all other surfaces support, as well as your Eucon plugin did. I'm trying to find a simple "single surface" source project to begin with.
Nanokontrol2 almost builded, but had these 2 errors:
https://i.imgur.com/6XbYDLf.png.
Klinke's one is too huge for a start, I think.
The only one that was built successfully, but with some deprecated functions and some other warnings, was Tascam 2400. Although, it has some code, related to WDL and also GUI part, as far as I can understand. And I don't understand it. 🤓
https://i.imgur.com/1JQww8v.png
https://i.imgur.com/zoSto91.png