Ah. I was thinking of the player preview (in the context of within the vanity menu, anyhow) simply as a larger version of the preview to the left of the vanity list, which changes to reflect the additions/removals made before saving. This way, the preview doesn't save the changes, but it shows what the player would look like should it be saved, and the user still has the option of saving or reverting.
For every profound and uplifting signature, there is an equally thought-provoking one. For every italicized word, there is a new fascination. For every parallel comparison of antonyms, a breathless captivation. Where someone writes to inspire, someone else facetiously mimics... :D