i advise against doing this. this will make it more complicated when restoring the wallet from seed in the future. most users will forget these extra steps. there's also no protection from mistyping the seed mnemonic. so overall you cannot rely on seed backups anymore and will have to take a softcopy backup of the wallet file.
just create a standard electrum wallet with a fresh electrum generated seed. here's a guide in case the op needs it.
I concur. just create a standard electrum wallet with a fresh electrum generated seed. here's a guide in case the op needs it.
Additionally, it may also cause confusion if the user attempts to migrate to another wallet... and then wonders why their "BIP39 seed" doesn't work in a BIP39 wallet and shows as invalid! (Because it isn't actually a BIP39 seed mnemonic, it's still an Electrum "native segwit" seed mnemonic.)
If you want to use Legacy with Electrum, you're a lot better off creating a fresh Legacy Electrum seed mnemonic than attempting to "force square pegs into round holes."
