How difficult will my revision be if my dorsal graft and radix shifted/rotated? Can it be done in a closed approach?

You have nasal asymmetry based on the photo.  However, the photo is not enough to understand everything about your nose.  For example, what did your nose look like prior to the operation?  Why was the dorsal graft used?  What kind of dorsal graft was used?  Did you have a septoplasty?  How was your breathing prior to the operation?  These are important questions that an experienced rhinoplasty surgeon would need to give you a better understanding of what needs to be fixed.  Using a closed approach would be a mistake.  I prefer the open technique because I have much more precision on how to shape a nose, position a graft, etc.  The scar on the columella, if work is done properly, is not noticeable.  I would advise you to see a board certified plastic surgeon with experience with rhinoplasty and revision rhinoplasty.  Good luck!