Would it be possible to make a change from lingual lite to lingual full braces?

Hey there, Recently I got lingual braces put on my bottom 10 teeth, and soon they will be putting them on my top teeth. The orthodontist told me that I wouldn't need them on my molars as they don't show when I smile and are functionally okay, however looking at photos i'd really like to have them all straightened as they can be seen and are behind the rest of my teeth. I'm starting to wish I had gotten the lingual full treatment instead of the light so I would have fixed all my teeth. I am wondering if it would be possible to ask my orthodontist to change / what the costs would likely be? :) Is it too late to ask to have them straightened as well if the braces have already been made?