You only need input source set. I think most mainstream brands support it - you don't need DDC directly, the easiest way is using the included driver which usually provides a utility console commands. Most common suggestion is something from Dell (with its Dell Display Manager).
Unfortunately I would need this to work on Windows, Mac, and Linux, and my home monitor (Samsung) only has a Windows driver. I can use a very simple m1ddc command on my Mac to select the input on my office monitor (Dell), but not my home monitor.
