My apologies I muddled it up with the Presonus one.
That said there are two option that I am aware of that you could use as a starting point. Basically anything MCU related will work wiht the X touch one. @Martin.Jirsak has been working on an Behringer X Touch (full) version which could be told to just use 1 slider and fewer buttons. Similarly the icon Platform M+ one could also be modified to just one slider and tweak the buttons.
The platform M+ scripts are here:
I am not sure if @Martin.Jirsak has released his Behringer one yet.