Depressions after rhinoplasty between the bones and cartilages can be a difficult problem. I absolutely agree that spreader grafts may be helpful in treating what is called, "an inverted V" deformity. This involves harvesting cartilage from your septum or ears and supporting the collapsed areas. This may help with the cosmetic appearance and if your collapse is decreasing your breathing, it may help with the breathing also.
Another excellent option is using dermafillers for a non-surgical rhinoplasty technique. I find that often I am able to exhibit finer control treating indentations and contouring the nose with fillers than during a surgical procedure which is very good at large changes.
Most importantly when considering revision rhinoplasty, have good communication with the initial surgeon. If you still feel the need for a second opinion, look for a surgeon who has a lot of experience with primary and revision rhinoplasties.
Good luck in your search for information!