For main character in game (with race, weapon and armor options) it makes currently 7 sprite atlases 2048x2048, what is _24mb. The last atlas is not full and only of 2048x256 size. I am running out of free space on my git hosting (bitbucket, 1,64 of 2GB).

I want to add 1 new sprite to my character. Unfortunately if I just add it, all 7 sprite atlases will be rearanged differently. So adding one sprite for main hero immidetly results 24mb commit. Is it possible to change only the last 2048x256 sprite atlas, without changing another 6 old full atlasses? Or somehow freeze all 7 atlasses and add 8th new atlas with only additional sprites added?

(I understand that storing images in git is at least doubtful praxis, but for main character it could be tolerated, i hope.)