A replasement to sugery

A match that could take template dna and use it to modify the sujects dna to whatever degree they what for example if the subject has brown hair and wants blond the matchine would take a blond hair gene compare it the brown hair gene and modify it to be similar to the blond. Anther example would be sex change which would be easrer to do and no scars making a surgery illrelavent therefore getting more costemers than a sugery so you could make it cheeper for more profet