Get reference to Game Viewport Client Class

[Roadified]

Is it possible to get reference to GameViewportClientClass?

I created custom class where I have logic where it checks if application is in focus or not and I want to get that value in Blueprints. Then I can do certain things when application is in focus and vice versa.

I know I can inherit new Blueprint from this class, but I cannot set that Blueprint as a default class in Project settings. I can only set the base c++ class that I created.

[3dRaven]

is your new class that derives from game view client marked as UCLASS(Blueprintable)?
You should be able to make a bp version of it and set it in the preferences.