If we are trading for a 2B, McNeil is my first choice. Not sure who would be my realistic second choice. I highly doubt Marco or Flexen gets us McNeil.I heard they were interested in some Japanese outfielder, but haven't heard anything about a pitcher.
It doesn't sound likely but Bogaerts makes so much sense to me. In the short term he could play second or shortstop, and once Suarez's contract expires we could move him to third.
Realistically if we're looking to flip Marco or Flexen for a second baseman, I think the best we're going to get is a mid-tier second baseman who might be a slight upgrade over Frazier.