Chosen Solution

This is the dual HDMI cable that includes the in line headphone control. I have a cut cable and want to purchase a replacement rather than having to pay Sony for a full out of warranty repair ($275 AUD). The cable is terminated with a PCB header connector inside the headset and is fully replaceable, its just I cannot source one.

Here’s how to splice an HDMI cable if you can’t find a replacement: https://www.youtube.com/watch?v=nDCcP95D