Actually I've never tried, I will have to reproduce your setup.

You used the mk4 nfc capabilities to create the signing device for the wallet, correct?

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Yep, and now it seems like the only way to export and import transactions too.

It works but I'd prefer having the choice to go totally air gapped.

What are the options if you start over?

If I create my key using the json file I'm then forced to sign with nfc. (Just re-did it all)

Maybe I have to do it with the xpub? But I tried and wasn't able to transfer the files into my SD card and the QR code provided is too small for my camera to see.

I press "sign" and it goes directly to nfc.