I did not ask you to do such a thing, just warned about possible malware that might be on the computer. If you don't want to export them to other client, then all you can do is wait for the transaction to be dropped by the nodes (can take multiple weeks). Most of the nodes on the network do not even know that such transaction exists, which is why it is not confirmed. At no point you will have to share ant  private keys with 3rd party. You can even check it from electrum's github since it's open source. However if you are not comfortable with instructions and help, then waiting is the best option.