Since you've had some pretty major work done, maybe the typical handlebar width rules don't apply.
How about temporarily trying a super-wide flat bar with bar-ends, and bring the hex wrench with you?
That way, you could vary the width without buying new bars, and you could even try an asymmetic position, if you discover your new biomechanical parts force you into it.
Once you find a position you can tolerate, get a bar/stem combination to reproduce your discoveries. If the chosen drop-bar clamp diameter/cross-section doesn't change, you may be able to offset it comfortably (we're talking small amounts, maybe less than one inch/25mm?
By the way, how about a different i.d. photo, something a little friendlier, maybe? Just asking.