VR and non VR modes in one game?

So I want to build a game that can be played in both “Normal PC mode” and VR.
I can achieve this if I let Unreal automatically detect a connected headset.
And if this engine option is checked.

Is there a way that I can start the game in a non-VR mode and trigger this option “ON” through blueprints even if the Headset is connected?

I want this for the purpose of having a main menu level where I can easily navigate with mouse and Trigger the next level in VR only if desired by the player (even if their headset is connected).

Thanks in advance.