It's difficult to say if Peck's choreography will or won't work in Spielberg's WSS without knowing Spielberg's take on, or vision for the storytelling.
Spielberg (for me) is an unexpected choice to direct a musical to begin with, but I know from everything he's done in the past, that I've not been disappointed by his movies.
I LOVE Peck's choreography, beyond just his work on "Carousel". I don't need him to choreograph WSS in the same way Robbins did, neither do I want him to.
As already mentioned, Robbin's choreography is iconic. I don't want Spielberg's version to mess with that; try to best it, or imply that Robbin's choreography is in any need of an update. That just isn't so.
I agree that Peck's "Blow High, Blow Low" didn't function narratively, as expected. What I saw instead was a LOT of characterization regarding the men who were dancing it. There was a boatload of masculinity (as well as a balance of ho-yay) happening in that number. Wrong or right, I found that appealing, and a surprisingly different way to tell part of the story.