I am running into exactly the same problem and I am very disappointed that every question of this type I find via google or on the oculus forums never got answered and is totally ignored. So please add non-Rift HMD Support. I am using Nvidia Gamestream to utillize my smartphone as HMD. I owned a DK2 before, but since the quality of both solutions is quite equal I sold my Rift and sticked to my Smartphone HMD. I was hoping I could continue to use vorpx, but with its lacking support it is currently useless.