If you really like your road bike,a quick fix might be barcon shifters. They plug into the ends of the bars. You'd just need the shifters(they should come with cables,but you might need to redo the housings). You'll have to move your hands around the bars to shift,but there's scores of curmudgeons over in the touring forum who wouldn't ride anything else.

edit: you could also then swap your Ultegra brifters for some regular brake levers,and prolly sell the brifters on eBay for enough to pay for the conversion.