If you want, you can simply setup a temporary offline machine or "amnesiac" OS like Tails without network connections that you'll use as Air-Gap Electrum where the private key will be imported.
Much safer that direct Sweep on an online machine.
You can use the temporary offline machine back online right after you've sent all of the paper wallet's bitcoins. (with 6+ confirmations)
The goal is to keep the machine offline while the paper wallet imported on it has bitcoins.

I recently created a step-by-step guide for that: /index.php?topic=5524213.msg64885706#msg64885706 (you can use WIF instead of the sample mini-privKey)
That includes the steps on how to spend using the offline cold-storage and online watch-only wallet.