Social workers, shelters, libraries etc are well placed to support that. They know these people because they see them every day.
If you choose to enrol in the "community assisted recovery" process then you could enrol a new device into your email with their help. Put a big red banner at the top of the email client saying "Community recovery via Topeka Library, Kansas".
Lifeline numbers aren't portable because people have no way to prove their ownership of the previous number, because they have no ID.