Thanks, going to keep at it!
I found that in the VR Pawn>InitData function I could set the Z rotation of the World Scale Widget to 180 and it now faces in the correct direction.
The flickering is still there though. Just to understand better the workflow here, why is it that the event dispatchers for the world scale widget are bound off of the “event begin play” but also within the collapsed graph “set world meters scale” that runs off the event tick?