Here's a link to a bike with a tall head tube, a similar setup as your bike. Look at the way the shift cables drop pretty much straight down. They look jumbled when viewed from the side, but if they go towards the other side of the bike after they exit the bar tape as I described above, there will be plenty of slack for turning the bars.

http://www.jamisbikes.com/usa/thebik.../12_quest.html