I searched on amazon also and found this cable but i dont know if it can handle higher refreshrates then 60hz (it says its for the valve index but im not entierly sure)
Another cable goes out to usb-c but it only 2.0 with 480mb/s i dont know if thats good enough for a headset
I searched this subreddit and found that somebody used the cable i linked on the main post and it worked for them. So my best bet is that one.
Have you tried the Club3d adapter? Some extension cables were tested from this company and were the only ones that Sweviver was able to use to run the 8KX, so I would think that it might be your best shot.
https://www.amazon.com/Club-3D-DisplayPort-Extension-Male-Female-CAC-1121-1m/dp/B07ZPCF4CH