Also, doesn't not having Anakin in the suit conflict with Obi-Wan's line: "A young Jedi named Darth Vader, who was a pupil of mine until he turned to evil..."? How will you get around that?

it will work
you need to look at it from the point of view of a first time viewer

the viewer would know obi-wan isn't telling the truth anyway, what's he supposed to say "yeah luke, i killed your dad. you must come with me to alderaan"

they would assume obi-wan is passing the blame onto vader to cover his own tracks and make vader luke's no. 1 enemy