[samstave]

This problem has long been a "what-if-cuz-that-would-be-nice" service:

Think of a last-pass for all your varied accounts, where the service allows you to update your core information and then select which of your accounts who have subscribed to your profile info should just be updated by the service.

So if you move - with one click, update all your linked account details for zip/billing/shipping/etc...

Obviously provide a diff review opportunity and a MFA heavy confirmation process - but with an easily revertible process as well.

as well as monitoring of logins to all, and alerts for any changes to any...