Bip39 Passphrase Generator. You'd then do a standard recovery that has a command much like the 1 below. (This command works by using a sample wallet file bunlded with BTCRecover) Anyone else who discovers the phrase can steal the bitcoins. It needs to be held secret, by way of example https://mylittlebookmark.com/story4259151/bip39-words-https-linktr-ee-bip39-bip39-words-an-overview