Again, the trick I've adopted for my offroad dropbar bikes is to run
inverted thumbies and/or "toggle" shifters (e.g. Suntour Command
Shifters) at / near / or, inboard from the brake levers. Getting the
bars up high enough so you are primarily in the hooks, as one might
with "bar ends" of a MTB flat bar, and everything is awesome!
Zoom in on these and you'll see what I mean:
https://www.flickr.com/photos/joe_bunik/16989152472
https://www.flickr.com/photos/joe_bunik/16984575193
=- Joe Bunik
Walnut Creek, CA