Specifically, I want to automate AFK state based on external data, such as if VRChat is the focused window, or other arbitrary conditions like status of a custom overlay.

With my current setup I don't get automatic AFK detection at all. I would like to be able to set the AFK state of my avatar with an OSC parameter. Pretty much how the End key functions on desktop, but ideally NOT a toggle button, rather a direct mapping of true-false = on-off.