Remove Caps Delay MBP15 Touchbar Late 2016
I was able to solve the problem. It seemed that the MBP was in some kind of HID configuration state which enabled the delay. To get the MBP out of the state, I reimplemented the 2015 Linux solution under macOS / IOKit. Sending 09 00 00 00 to the Keyboard, and then going through the remapping in Preferences again, removed the delay.