Quote from: bitmover on Today at 08:49:19 PM

This address is also obsolete Cheesy

Unless you are using the console, you can only create a new wallet that uses bch addresses in electrum new versions.

Not for individual vanity addresses like this. You simply create a new wallet, select "Import bitcoin addresses or private keys", and then paste the relevant private key with the prefix "p2wpkh-p2sh:" for a nested segwit address such as this one.

Quote from: bitmover on Today at 08:49:19 PM

I agree that it is trivial... but I expected those basic features to be universal, and not something that only works in electrum and a few more wallets.

Well, there's more to it than that. Creating a universal signing scheme which will work for all bitcoin addresses and all script types is not trivial. If you are really interested, you can have a read of BIP322 and the issues surrounding it:
https://github.com/bitcoin/bips/blob/master/bip-0322.mediawiki
https://github.com/bitcoin/bips/pull/1347
https://github.com/bitcoin/bitcoin/pull/16440

Electrum have a created a very specific solution for signing with one specific type of address. And so if you want to use this specific solution, then just download Electrum.