YO I JUST GOT IT TO WORK TOO!!! I got it after messing around with the nodes from the post you mentioned ( https://forums.unrealengine.com/t/vr-camera-rotation-around-itself/459978/4 or I think this is it anyway) but I got it to work by simply replacing the custom event with the input action I use for turning normally. If you have a multiplier, just add that before the first connection.
This is my current code for reference, if it still doesn’t work lmk and I might be able to help