Here's my lane-splitting set-up
I didn't run into the short brake line issue because I switched out the brake master cylinder to a 19x18 and cut about 3/4" off the ProTaper Reed/Henry bars. There was just enough straight bar left for all controls and the stock brake and clutch lines reached.
BTW, that's a mirror from a KTM 990 SuperDuke. I just happened to have one and bar end mirrors of any type don't work for lane-splitting (at least if you're doing it every day like on my commute).
Bill