The comic version of Anarky would have been much easier to render in CGI with his metal mask having a frozen expression that they wouldn't have to bother animating like they do with the BtB version. I think that if he were intended to be Anarky from the start that they would've opted for the unmoving face option just to save time and effort.
I doubt it, since that would've been visually boring. Think about how often animators put facial expression into masks like Batman's or Spider-Man's, having the eye holes change shape to convey emotion even though they should be immobile.
I think they said they departed from the comics' Anarky because he looked too much like V from V for Vendetta