Bip39 seed to private key https://bip39marco.mystrikingly.com/ Though it uses BIP32 approach you could however import BIP39 seeds into Electrum wallet. Also other than BIp32 There exists BIP44 Model which some wallet use for your era of seeds. It can be straightforward — if you do not stress about copyright inheritance, https://bookmarksparkle.com/story19988951/bip39-word-checker-bip39-compatible-wallet-options-https-linktr-ee-bip39