1- Create a new save
2- Edit your character appearance to the appearance you want. (You can use the Appearance Change Unlocker mod to save your previous appearance as a preset.)
3- Save you game once allowed
4- Download the Save Editor https://www.nexusmods.com/cyberpunk2077/mods/718
5- With the Save Editor, open a save you created in step 3
6- In the Appearance tab, select save preset
7- Load your recent save in the Save Editor
8- In the appearance tab, load the preset you created in step 6
9- Select Save Changes
9- Load your newly edited save and Enjoy :)