My female Kira also has an inverted vulva. It was discovered when she was younger. Our vet told us to keep the area clean and dry -- we use unscented, alcohol free baby wipes, and a paper towel to dry. We were also told that as she ages, incontinence could become an issue. We didn't wipe every time she pee'd but once or twice a day.
She is 9 now -- from my research, they do not grow out of it, they just may not have issues for quite some time. Kira did develop a case of vaginitis about a year and a half ago, as she did develop incontinence, and the area being too moist, she developed the infection. She was 'leaking' pretty heavily. We cleared the infection -- we have not had one again. She is on Proin for her incontinence, it has helped her greatly, no leaking and no further infections.
Personally, I would avoid surgery unless the issue is severe enough and it is a last resort. Kira did fine for years with us just keeping the area clean and dry, until she developed the incontinence, and at 9 is doing well with the management of the incontinence.