Ah, good idea. I didn't know that software would show it that way. Attaching a screenshot in case anyone else is looking, this may save you from having to install java, lol.
Also had a look at the Fellten diagram. They do have a wake signal output, so I'm pretty sure that's what the Thunderstruck MCU is looking for on its 'plugin' input. Oddly it doesn't actually mention which wire it is in the harness. The MCU manual also doesn't seem to explicitly say how things are wired when not using the Fellten controller to manage the OBC, but my guess is that it just sends the wake signal, forwards the cp/pp info via CAN and lets the MCU do as it will with the OBC. If that's all correct then MCU owners probably don't need a switch at all.