Trezor one bip39 https://files.fm/u/2eemhhak2q#design Though it works by using BIP32 process you may however import BIP39 seeds into Electrum wallet. Also in addition to BIp32 You can find BIP44 Variation which some wallet use with the generation of seeds. The amount of security does a passphrase add? A BIP39 passphrase https://bookmarkindexing.com/story19895159/bip39-dictionary-the-greatest-guide-to-bip39-https-dzen-ru-bip39-phrase-com