Get a hardware wallet. Or a SeedSigner device.
...Or set up both your cold storage and companion watch only hot wallet with Electrum on laptops with cameras, hence allowing you transfer those transactions (unsigned and signed) as QR code images.

If you're adding a secondary cold storage:
* you're doing it wrong
* you've misunderstood something and need to read more

However, this is off topic, if you have more questions please make a new topic with them.