I have the impression that this cable is a very FP specific thing. At least I have never seen this before. So I’d be surprised if you found that elsewhere.
But what about just getting an extension cable of the desired length? I have one on my Desktop PC and it works without problems. They are readily available and much cheaper than this special cable in any case.
Edit: It seems I was not entirely correct: Other such cables seem to exist, but I found nothing longer than 1.5m when doing a quick search. And they’re also not cheaper than a simple extension cable.
Various suppliers have similar connector cables up to 2m.
But up to now I found nothing longer.
Just to add to this discussion for others who might be curious.
I got also a solution to use a 3m cable with 3.5mm mini-jacks on both(!) sides plus a short USB-C to 3.5mm converter at the headset. No idea what this might do to sound quality.
btw: Who marked mde’s post as solution? I didn’t
Something wrong with the forum permissions?
Edit: Funny - my own post has been marked too - automagic!
Just because they have the same connectors, they might not have the same functionalities. So a 3.5mm extension cable is still the best solution in my opinion.