Hi Greg, it works with Steam VR, but we are talking in (windows) extended mode (in Piplay it is called Video Mode). In this mode you use injectors like VORPX, Tridef, to have SBS (Side by Side) feature and play it on Pimax 4K (or any HMD). But the problem as stated before, there is no Gyro support. That is what I expect from you (soft) to support it. And the best way is Gyro (input) and mouse emulation (output).
Thank you Greg