To get the handlebars farther back (closer to the seat) I have installed a shorter stem with a high angle. I've also swapped flat bars with 4 inch riser bars, then rocked the riser bars back towards the seat. Both methods work to create a more upright comfortable riding posture.

The challenge with doing this is that all the cable housings become too short so must be replaced. But we like mucking around with bikes, don't we.