Usb On Speedtwin

Hi all. I am new to this forum as I will be purchasing a Speedtwin 1200 next week. Is it possible to wire in a USB socket to an auxiliary 12 v in the headlight bowl. My Honda CB100RS had wires or a plug ( I can't remember and unless it's worth keeping I can't be bothered to check) in the bowl for that and I was wondering if it was worth keeping my USB socket to wire into the Speedtwin. If the only place to wire one in is under the seat I may as well not bother taking it off as I believe there is already one fitted there. (daft place to put it) I will eventually get a manual for it and that'll help.