After three weeks using the Ottopot controller by @gerotakke, I can confidently say that I LOVE IT. With Bitwig it's like hand in glove.
The only thing that bothers me a bit is the LED brightness in my dim light studio. After some iterations, I am going to order custom stickers. I'm an Inkscape nullity but I got what I wanted from it. In the pics, my "prototype" with plain paper printed with an old inkjet. Approved! I'm ordering the stickers on Monday.