No, I don't think he's ready for center duties. He was still one of the worse winger non the team defensively as he often lose his man and has constant trouble getting out of the zone. And the centerman has greater defensive responsabilities in his zone.
I say let him build full confidence in his game by playing on the wing, then he'll be ready. Now it could be dangerous that he lose all confidence if he sees the opposite line score many goals against his line.
It really does make more sense for DD to play wing. Eller is a monster defensively and DD is junk. That alone should settle the debate. He'd have so much space on the right wing and could still play with his husband. Pacioretty-----Eller----DD could be a great line. A little bit of everything with that line. This leaves and open Centre position for Galch and he can be reunited with Gallagher finally.
I think he would be fine as 3rd C and take DD's PP minutes. I can't see patch complaining about Chucky being the 1 setting him up instead of DD on the PP. Plus with Eller at wing with him on the 3rd line it helps carry the defensive load, Eller could also take the important face-offs until chucky gets better at it.
Rushing a player is never a good idea, seeing as we see him leading our first line in the fairly near future I'd like to see him start progressing at that position. Eller can be swapped to C when they play top tier teams if needed.