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
Could be set up like a moustache bar and it isn't too expensive since you only need to swap bars and not buy brifters, etc. And that is generally cheap to do.