Is the body bolted down solid on the frame? For that fine tuning that body has to be bolted down, not just sitting there and God forbid on saw horses or something. Bending the hinge a little is very do-able. Look at your gaps, if the door is a little down at the back and it's tighter at the top front to the cowl than the bottom you want to bring back the bottom, if the gap is tighter at the bottom than the top at the front you want to bring in the top to raise the rear. Understand? You may want to go straight up by simply raising the whole door, or you may want to bring the bottom back to raise the rear or bring the top forward to raise the rear. Any of these three methods would do the same thing, which one makes the most sense to leave you with the best gaps is the question.
But first be sure that body is bolted down properly. You can even shim the body to the frame to raise the back of the cowl raising the door on many older cars, the bodies aren't that strong and move a LOT. This is without a doubt a perfectly fine way to align a roadster door. With yours I am not so sure, I am thinking it would be a fine way to do it.