VC paper has two different emulsions for a different intention than widening the spectral sensitivity.

VC paper is like having two papers in one, the first a high contrast emulsion, the second a low contrast emulsion. The two different response curves are designed to be complimentary to each other and only exist to give the user contrast rendition choice.

The prototypical orthochromatic film has just one emulsion layer that is sensitive to a wider spectrum -blue and green and UV - to give a more natural rendition than the plain emulsion that is sensitive only to blue and UV.

I suppose that with modern technologies, there's nothing I know of that would intrinsically prevent film makers from making a more complex ortho film with multiple layers, but the essence of an ortho film can be expressed with a single layer.