G'day ladies and gents!
I managed to pull the SKC yesterday afternoon. I
did use VAG K+CAN Commander 1.4 in the end, with it's own cable.
It was working all along, it showed up just above the mileage panel, kind of greyed out, so I didn't notice it had been showing each time I tried reading the cluster.
I'll install it permanently over the weekend, and code it to my ECU and 4 original keys.