That's kind of the unfortunate thing about VR. The most attainable HMDs are provided by shitty companies like Samsung and Meta who have no incentive to support anything other than Windows. Besides that, high fidelity VR is prohibitively expensive.

There were rumours some time ago of Valve working on a standalone, semi modular VR system. I hope it comes to market, as I'd imagine it'd have the potential to be much more affordable (at some level) than the index.