I was thinking about a universal tool for this, a tool where we give a text file with addresses and it runs and verify if they have balance
The problem with "a universal tool" is that you'll need to trust it. It needs to run on your system, which is a malware risk.
1.-We create the text fixe with the addresses.
2.-The program downloads the list of addresses with balance from LV site.
3.-The program compares the address.
4.-The programs create a new file with the address with the balance followed by the amount.
I can do all this with one line of bash script (see above). All you'll need is a Linux system, which can run from a Live DVD (or USB stick). This way you're not risking anything.