I think it would’ve been awesome if Anakin wore the Vader mask, robes, and armor as soon he was knighted a Sith. Not only would it be badass but it would make sense for him to want to conceal his identity. He could have the mask off during his duel with Obi-Wan if one insisted that his facial expressions need to be seen for the right emotional resonance. Then after getting burned is when he gets the cybernetic lungs.

I also think it would’ve been cool if perhaps one were to take cues from Canon Grievous and have Anakin upgrade parts of his body with cybernetics, perhaps in an attempt to feel more powerful, an illusion of immortality.

Essentially, a more gradual physical transformation into Vader, that would logically coincide with a more gradual spiritual one.