Originally Posted by
ColonelSanders
You could try something like a Soma Oxford handlebar and invert it so that the bars drop 52mm and you would then be able to use your existing gear and brake levers.
If you find this isn't close enough to what you want, then you could go the full hog and get a dropbar, brifters etc.
Soma Oxford Handlebar
This setup has the advantage of going back to flat bar easily anytime. I used a FSA Metropolis bar for a couple of years but decided to go back to flat bar recently and the switch was very easy. One thing to note is that switching to this type of bar from flat bar may require longer cables and cable adjustment.