I was pretty annoyed with the PSVR2 not having any built in head strap audio, so I picked up a Vive DAS on Black Friday for 16$ and used the headphones for this. I tried to position them so that they float over your ears like the Index. They take the place of the little rubber things and just clip on. Use the original screw from the DAS to attach the speakers.
The author marked this model as their own original creation.