Making a character customization screen?

I'm trying to make a custom character load in custom accessories while still retaining parts of the custom character model.

For example, I might want to make a character customization screen, and have the parts of your character be based on your configurations BEFORE your model loads into the workspace.

However, by using StarterCharacter I am not allowed to edit the character via the CharacterAdded event, so how can I do this easily? Should I just change the properties once the character model is loaded in the workspace?

I basically want the StarterCharacter to be customized on login, or by default retain some features in your original avatar.