Reach out to Moon Audio if you don't get any interest from here. I reached out to them about re-terminating a USB cable of their's and they said it would cost $50 to do it. Not sure if they would other cables that are not their own but worth asking.

Null-Audio in Singapore. A bit far away from CONUS. Nice & professional people to work with for a reasonable price.

I can do it for you but I’d prefer you pick out the 3.5mm, there are so many options out there.