With what you have, you could run a charger socket from it, but it would only work when the lights were on!
Another circuit for the 12v charger is better, and you have the option to run GPS/grips/heated clothing etc, leaving the 12v socket for ad-hoc stuff such as phone/netbook/ipod/camera etc.
I supplied Keithblade with one of these a few months back, it looks the same as what you have for the lights, but the relay isn't sealed-in and it goes into the side panel. The 16A DIN connectors are available on ebay (
16A DIN Socket Link) and come with plug and socket, you then need to purchase a 2/3/4 way fag light type outlet (
2v Cigar lighter Link), make your cable long enough and you can put it in a bar bag / tank bag / tail pack. I use a curly cable and it can do all three, I also have a short single 12 v fag light extension that goes in my bar bag, to keep my power hungry Andriod phone topped up on rides.