There is no plan art the moment... Create a new npub and secure your nsec key
Discussion
How do you let others know?
That's a tough question... I've seen people today their display names... For example "Braydon Fuller [old npub]" but if someone knows your nsec they could always change it
For folks with larger followings, they can let people know on their podcasts via RSS. For others we can tell friends via Signal, SimpleX, GitHub and etc. perhaps some others?
And yup, an attacker could change the profile to anyone. They could impersonate someone else and with some credible WoT.