You can get one of those kits from Halfrauds and easily wire it in with that. Costs about a tenner IIRC.
I did that with mine, then wired it into a OEM switch on that wee panel to the right of the steering wheel (if you have the coin holder it replaces directly with the 3-switch panel out of any scrap car).
My back fog works from there too. And my middle switch is a USDM dash-brightness controller (which only changes the brightness by about 5% and is pretty useless to tell the truth).
I also fiddled my foggers so they come on with full beam headlights while I was at it.