I have Trekking bars (XLC) on my Trek 720 commuter - I went with reverse aero levers and Tektro RL721 cross levers - had to drill out the end of the bars. If doing over, I would use four RL721 levers on the bars, and no drilling. I used an old MTB bar extender to hold my mirror, and a Topeak Extender for my two headlights. The bars are fully taped, so hands can and do go anywhere. Sunrace friction shifters are mounted close to the clamp and accessible from several hand positions.

If wanting V-brakes, Tektro RL740 levers - SJ Cycles or ebay.