Keep things simple. I use Dia-Compe Retro-Friction shifters, which require no adjustments aside from ensuring the upper and lower limit stops are set on the derailleurs. My brake levers are non-aero type, and all of them are very easy to replace the cable inners. I run a 6-speed freewheel, and carry the freewheel removal tool. The rear spacing is 120mm, so bent/broken axles are less of a problem than if I were running a 127mm rear-spacing. STI levers, indexing, etc are un-neccessary complications.