I mean I picked Priest because he did a very good job when he fleshed out characters in his Deathstroke series, like Wallace West or the New 52 Powergirl. Plus he’s a pretty high profile name, or at least I think he is, that I think he would lend some of that profile to Duke.
I would also consider David Walker, Sam Humphries, if not Snyder maybe Tynion or Williamson, and as strange as this may sound Bendis. Hear me out, but Bendis wrote a very good Batman Universe series and he’s great with Street level characters, but he’s not so great with character history at times. However if we were to give him someone as fresh as Duke who he could do anything with in the Batman mythos then he could pull off something really cool.