Modifying HMD Input with Blueprints?

I’m experimenting with a few different ideas that all involve adjusting the input of the HMD - for example, I’d like to restrict the maximum angle a player can turn their head so that when looking 90 degrees in one direction, the input is halved to 45 degrees, thereby only allowing the player viewing access to the front 180 degrees. I’ve tried modifying the Controller Yaw and Pitch inputs but it would appear that the HMD overrides these functions.

How do I modify HMD Input? Ideally in Blueprints, I’m not C++ savvy!