ssYou could use an adjustable stem- but once you find your "sweet spot" swap it out for a fixed one. But I'm by no means a drop bar expert, so I'll let others comment on what you are proposing to do.

Flat bars with good grips (Ergon) + bar ends makes for a pretty comfy ride. If you want to attack the wind, then you could install a clip on aero bar. Or you could try one of those butterfly/trekking bars that will get you more upright closer in, but allow you to stretch out a bit (depending on how you orientate it).