>>1220312Just fit the brakes and levers back on the same way you took them off. Don't forget to put them on the bars before the grips. The only snag you might run into is that your housing might be too short if you get wider bars or something.
You might be better (and more easily) served by just adding some barends. Most people I see have the big bullhorn type. If you get those, get some bar tape or another set of grips so you aren't just grabbing onto metal. I like these smaller Bontrager ones.