I read that Electrum stopped its options to create new wallets with 1 and 3 address types. Could we do this in Console of Electrum?
Yes for standard Electrum seed,
make_seed command takes a seed type option like "
standard"
But you can't create P2SH-SegWit seed with it since it's never been generated in Electrum natively.
If you want a SegWit "
3" wallet, import a BIP39 seed you've generated elsewhere by ticking BIP39 seed in the option and select p2wpkh-p2sh option when prompted to select the script type.
Forcing your Electrum seed to be imported as BIP39 will work but the process isn't standard so it's not recommended.
Or if I want to have address types like 1 and 3, I have to create a wallet with Segwit addresses, then I import its private keys to have 1 and 3 address types?
That will also work.
There's no issue in importing a private key and deriving a different address type from it, it can spend from it without issue.
But creating a backup of this will be more troublesome than backing-up a seed phrase.
The issue is importing an uncompressed WIF private key as SegWit/Nested-SegWit but Electrum wont allow it.