I just stumbled over a new Steam offering, valid since February 9. 2024:
Nofio wireless adapter for Valve Index is built for serious gamers. It comes with everything you need to convert your exising Valve Index to a truly wireless VR Headset. With a dedicated wireless transmitter and receiver, the conversion to wireless is easy, non-destructive and removeable. Simply connect the base transmitter to your PC (DisplayPort, USB and Power), attach the receiver to your headset and connect the supplied short Oculink cable and you are good to go…
I wonder, if Pimax can deliver the WiGig Module.