Inactive account manager plugin

Google has an Inactive Account Manager: if you don’t log into their services for awhile, they’ll email you a reminder; if you still don’t log in, they’ll give your password to someone you’ve designated. It’s a great contingency plan for accidents.

Is there anything like that for WordPress? For example, if no administrator account is active in so many months, the plugin emails the site owner; if they still don’t log in, an existing and predetermined user account is promoted to administrator and that user is emailed.

I’ve looked in both the plugin repository and on Google and can’t find that anything like this exists — but it’s something I’d use on all of my sites if it did.

-Ken