scale HDRI Backdrop mesh "non-uniformly"?


I would like to use the HDRI Backdrop for an environment that is a rectangular interior space.

Is there a way to scale the “EnvironBox” or whatever mesh specified in the Mesh slot “non-uniformly” to better line up the projection and avoid projection distortion a bit better? Not aiming for perfection projection nor distortion-free, but just better than projecting the HDRI onto a semi-spherical dome or perfect cube that all scaling uniformly in all three axes.

I probably could use a custom made geometry that has somewhat matched dimension of the room but I am trying to achieve this via what is available in the engine.