I believe this is the ebay seller I used to make me a custom length rear line, the ad said banshee, and allows you to specify what length up to 72" and what size, degree angle, and orientation you want the fittings, all for the same price which was $30 sumthin for the 22" line I ordered. they were the most reasonably priced I could find to make me a custom length line
for your application, 2 seperate custom length lines is the way to go, and use a double banjo bolt to connect both lines at the master. (what I run now too)
the top of this ad says FZ streetbike, but notice in the sample order form below it says banshee
scroll down and you'll see the fittings, sizes, ect. and fill out the order form...........
http://www.ebay.com/itm/YAMAHA-FZ700-CUSTOM-STAINLESS-STEEL-BRAKE-LINE-HOSE-/121607745928
the dual line banjo bolt:
http://www.ebay.com/itm/10MM-DOUBLE...00-Metric-Brake-Fitting-Adapter-/121607778870
they also have a # listed in the ads,
1-866-939-3953 worth a call to see if they can hook you up ?
streamline splitter style or dual lines in standard or +3 length are $60-ish, so maybe these guys can get you what you need for maybe $80-ish ?