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If you are on an Android device you can export an encrypted backup and scan a QR code / type in the password to the encrypted archive to transfer messages / group memberships with only a safety number change in most cases.

https://support.signal.org/hc/en-us/articles/360007059752-Ba...

No dice for iOS unfortunately.

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I think that's the opposite of what I want? I want to inform people of the new safety number using the old channel and purge all data like a good user.

In this respect a keybase like model makes more sense to me.

Two small corrections: Signal-Android's backup works with a passphrase only (no QR codes involved) and does not cause safety number changes on restore.

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