I would call Dr. Lindsey as he is currently working on a case of vaguely similiar nature. The only time I have ever heard of people discussing their reduction, expansion, and flap type procedures has been in the context of the "bad old days" of hair restoration and being repaired out of desperation. Top clinics do not do these type of surgeries anymore. I think you are very lucky to be satisfied with what you had done and I would look into getting grafts implanted in your thinning areas and would not tempt fate with another flap type procedure.