Someone has remade P.T. in Half-Life: Alyx and it's as terrifying as you'd expect. Modder AmbientDruth took Valve's VR-exclusive, stripped out all that is City 17 and replaced it with the horror of Hideo Kojima's endless corridor.
The game is designed for VR, of course that's the best way to experience it. But people who can't afford VR or find it makes them sick can use stuff like this to play the new Half-Life with and that's OK.