I thought about this when doing my project, but then decided it would be too much hassle and add to the cost! If you want to keep a "normal" bike look, put both levers on the bars but only wire up whichever hand you feel most comfortable braking with. I have it on the right (dominant hand) which isn't ideal for signalling right turns in this country, although you learn to slow down with your legs enough while signalling and then apply any braking if necessary.
I haven't googled anything, but SJS is another possibility if you haven't looked there.