Keystone bip39 https://andersonsaeu988.iamarrows.com/bip39-generator-online-the-best-devices-for-secure-wallet-creation While it uses BIP32 system you'll be able to still import BIP39 seeds into Electrum wallet. Also in addition to BIp32 There is certainly BIP44 Variation which some wallet use for that generation of seeds. One example is, should you in the beginning set up your wallet https://www.tumblr.com/generalllamacolor/787594721599078400/can-you-depend-on-online-bip39-generators-a