Thanks!

I think it would make sense to automate some of this considering the number of lines.

If the dumpwallet contains the wallet addresses, then I could make a backup of those addresses in another file and move it to another machine from which I can look up the addresses on the blockchain explorer.

Then I have a list of addresses which I know contain funds and extract private key only for those

By the way, does Electrum wallet need to be online at the time of private key import process?

Also, once the private keys are imported into Electrum, I can move the coins from Electrum wallet without any need for additional passphrase or authentication right?