i found a profile online , using the vietcong starter converts the game to DX9. But the visuals are very poor and lots of distraction , in z buffer and z normal the game would look good but all is sunken one grahics layer beaneath level. So not usable, g3d somehow works, but very wonky.
If you can convert the game to dx9 then you could try running reshade and use the depth3d shader to get stereo 3d image.
Then go to vorpx and run the desktop viewer
Within vorpx go to image settings and set content type to stereo.
For this method to work you also need to add the Vietcong executable to the vorpx ignore list. Otherwise it will try launch into regular vorpx mode.