Thank you for the clarification. In this case, it would be easier to recreate the card according to an already prepared version (literally make another character out of stock Chika Haruno). Of course, fewer people will do this than those who will be willing to buy, but most likely 1-2 such people will be found who initially made such alterations for themselves (this does not require studying the inside of the map). The only question is whether these people are willing to share.
As a last resort, someone could try to convert a koikatsu card into a conditional artificial academy (or, more likely, into a blender), and the other, having no original, converted it into the first one.
I do not know exactly how this can be done, but maybe someone will be interested in such a marking removal and he will try.