Most off the shelf frames can pull double-duty no problem. The Fujis, Felts, and Trek that I mentioned above I know come drilled for brakes. One could easily have a set of road bars with brake levers and brakes for commuting. Then remove the bars, levers, cables, brakes as one unit and install track bars and you are ready for the track. That operation probably takes 5 minutes, tops using only allen wrenches. Use velcro strips to tie the brake cable to the top tube.