I could see Chandler being a nice insurance policy for Baynes, but he's not worth giving up any assets for.
The only realistic way we could, or should, acquire him would be if Phoenix bought him out. And then we'd have to contend with other teams that might be willing to offer him more playing time. He'd probably only see the court for the Celtics if one of Horford/Baynes was injured.
I'm also not sure that Chandler has any interest in chasing rings at this point in his career. He's been on record saying he's content to be a mentor for the young players on the Suns.