Unfortunately the armor design team... drew inspiration for the Dragoon armor from Dark Knight armor, perhaps even more so than they did from Dragoon armor...

The traditional curved armet found on Cecil's (pre-redesign) helmet that is featured in Yoshida's rendition of the dark knight, as well as the chocobo one above, and generally associated with pre-Nomura era dark knights, is actually the fashion of the Dragoon's artifact helmet.

A face mask similar to the Cecil redesign or a full helm similar to the one worn by Golbez (both feat. in the OP's post) would probably be the most desirable direction. Either way they're going to have to go solid black, with perhaps red highlights, because if they go into blue or purple as with Cecil, it's going to look far too similar to the Dragoon, imho.