The supplied adaptor lead is about 200mm long with a standard USB socket one end and the special plug to suit the Honda socket on the other end.
If we could identify the special plug, then it would be easy to make up a similar lead using half of a standard USB extension lead, with the special plug soldered on.
My lead has a plug, roughly similar to a USB plug but with a retaining latch and with the following letters embossed on it, PTB, JAE, PC.
It could therefore, possibly be some form of computer plug.
Can anyone help to identify it?