Yeah, it’s rough going backwards, or downright impossible. I grabbed a FFB wheel the moment GT4 came out and supported it, and there is simply no way I can enjoy any kind of a racing game or sim anymore without good FFB. Then I started stereoscopic gaming with GT5 on PS3 and simultaneously on PC through third-party software (there were essentially zero stereoscopic PC games at that time). I haven’t played any “flat” games since except a handful of classics that have been ported to portable devices (Baldur’s Gate etc.)
I don’t know if ReShade will work with Doom Eternal, but you could try alternative methods of forcing stereoscopic play if you don’t mind it being z-buffer only and not full VR. Worth a shot if you are tenacious and absolutely determined to dive into Doom Eternal as soon as possible.