Thanks for the fast responses both.
It seems that using the power hub will make the k6 operate as if it was just connected to a normal switched usb port. Looking at the previous forum posts and the instructions it looks like it will work in the bicycle mode where you need to press the button to turn on and off each use.
I’ve unfortunately already received the power hub and cut off all the fuses. I’m going to crimp on some Deutsche connectors and make a plugin harness for the accessories. So in the future I only have to pin a connector to any new parts and everything is removable / transferable. I repinned the bikes single switched accessory connector to the hub trigger wire.
I was going to use a normal auto parts relay, but when I saw the power hub I thought it would be more expensive but a neat OEM+ solution; but made the wrong assumption it would be compatible.
At least I can use the power hub as a switched live for the k6 trigger.
Thanks again