Hi Mick
Welcome to IIS!
I have the same problem with the cable, it's too short and being coiled it makes it even worse.
I asked a similar question back in January but I can't remember the answer. I know a few people have made their own similar to what you want to do. I'm sure they'll post the response soon.
I didn't do anything with mine at the time and for now I've just been living with it, but might take the opportunity to make it longer and better.