the grip I use most often is towards the front, not the back, so sweep is all about hand placement, choose a shorter stem, that will move the bars back and make that the most comfortable reach.

options
http://www.sjscycles.co.uk/modolo-yu...ack-prod15573/
similar to the ITM ones I got, , NB the sweep is on the front of the bar,
you just move your hands back to brake and , perhaps shift gears,
i have a grip shifter and MTB brake levers on mine,
that slides on the back, open end of the bars. double wrap of padded tape..
BBB's multibar is another one..

http://www.sjscycles.co.uk/modolo-du...nds-prod18737/
These are very adjustable, so angle is a choice..