As an admitted altoholic, whenever I make a new character, I pull out a total makeover kit from my bank and see if any of the unique effects fit them better. There are some problems with this, though; the window for seeing your face is smaller, and I’ve already settled on a face I like in case I don’t change it. The new faces are pre-adjusted by your existing facial customization settings, potentially distorting them in a way that obscures the options compared to being able to look at the default faces side by side.
The suggestion is to be able to “send the kit to creation”, so to speak, something like a transmutation charge. Next time you create a character, the new faces/hair/colors are available, with default appearances and the larger chargen size. If you pick options that need it, a popup warning lets you know that making the character will consume a kit. It would be much easier for me to use the kit for a new face, than to replace an existing one, in that way. A less coding-intensive option may be to let the creation screen detect if your account has any kits in the bank and give the option that way, allowing them to remain in the bank to be used in creation OR to modify an existing character.