Bip39 npmjs https://blogfreely.net/travenmdoq/create-your-own-distinct-bip39-mnemonic-expression-with-python-scripts Even though it utilizes BIP32 system you could continue to import BIP39 seeds into Electrum wallet. Also other than BIp32 There is certainly BIP44 Edition which some wallet use to the technology of seeds. Want to examine which wallets support the BIP39 mnemonic recovery... https://socialmediainuk.com/story25133760/bip39-add-private-key-bip39-converter-an-overview-https-cutt-ly-uryc5rw7