Please don't hammer the Electrum network with a gazillion pointless requests. If you need 10 or 20 lookups a day, sure. If more than that, do it offline with a recently updated list.
FWIW OP could run his own full node and Electrum server, then configure Electrum wallet software only connect to his own server.
Such list for now (just checked) is 26934 GiB in size.
It can be done with utxodump program.
You get txids, pubkeys, addresses and few other info.
But it seems OP wants public key from all address though, not only public key from current UTXO.