So for those having similar issues, the way to get it to work right is to add a collision to the vr system, and change the collision type to pawn. This will let the demo see the player and pass the triggerblui to the vr pawn. Also I found replacing left mouse down with Trigger Left Click works well to reduce BluePrint footprint if you don’t need to drag elements like slidebars.
Have fun, and thanks for your advice!
I also used the 4.26 Demo to experiment with, which you can get here: Releases · oivio/BLUI · GitHub