That's what I did to one of my bikes. It's an old Trek 1100 which had horrible, uncomfortable drop bars on it. I swapped out the flat bars (with bar ends) from a bike I wrecked as well as the trigger shifters, and it made it into a much more comfortable bike to ride. My newer bikes have much more comfortable drop bars so I don't have an issue with them, but that one wasn't much fun to ride until I swapped the bars.