I don't have this built up yet- but have been fiddling with shifters, IHG and drop bars.
You can fit an Alfine trigger on to a Salsa short & shallow handlebar and slip it past the
curves & bends to mount it on the flats. Then I'm planning put cross style brake levers on the,
as in the attached image. Hope to have all the parts and pieces here within the next
few weeks to actually finish this project.