I was just turned on to that by a friend of mine who did his retrofit a little while ago. I got in touch with Andrew, and am having a bit of back-and-forth with him discussing different options.
Canadian cars come standard with DRLs (law since '89) and usually it's the highbeams on reduced power. My car's in the shop at the moment 'cause I got rear-ended by an X5 two days ago, so I can't just walk out and check--is it the same for the Focus? If not, I may ask my buddy to see if he can rewire the fogs to just always be on whenever the car's running.