Is there a way (e.g. through a combination of jumpers/switches) to expose the keyboard RP2040 to an external USB host? like the unbricking guide explains how to expose the sysctl RP2040 via the SYSUSB connector?
I suspect there is not … since if there were then the guide would be shorter. You wouldn’t need to first flash the system controller and boot the machine to reflash the keyboard firmware. Maybe in the future?