The 4k headset works default in 1440p in PiMax Mode unless you are low spec mode or have chosen 1080p. If in Low spec mode you can enable full mode.
1440p is available in both modes. So not sure why your needing to use hacks & such.
Also consider exploring Revive as @Enopho has used this to inject vr into games like dying light.
I think this is why some maybe all alienware laptops disable intel igpu support.
I do apologize if i am missing something; its almost 2am here… Been a long hot day.