Could not have said it better, that socket is all kinds of wrong!That certainly is one fugly way to do it!! Sorry!!
Also I do think you be much better if with a USB socket. I custom make switch panels and am based in Coventry so sure I could sort you out something for a good price that is much more attractive.
Have a look on my website and see what you think. I can do anything you like but easy on a t4 is just drilling a hole in one of the blanking plates by the stereo and fitting a usb socket.