Since I could not find anything about it, I wanted to mention that the Behringer X-Touch mini MIDI Controller works flawless in FS2020. I used following guide: xmini2vjoy.py - Utilities - X-Plane.Org Forum
The X-Touch mini is a free programmable digital MIDI Controller designed for musicians. It offers 8 rotary knobs with pushbuttons and lots of buttons in 2 layers. As always, people find ways to use it in other ways. A lot of people use it for manipulating photos in lightroom. Fortunately somebody found a way to get it to work in X-plane. The same guide works perfectly for the new flight sim. So for less than 50 € you are able to get a perfect peripheral for turning knobs and pushing buttons. I use it to manipulate the autopilot.