Is there a wallet like electrum that will let me import/export signed/unsigned transactions? I prefer to only ever create and recover my ‘main’ storage addresses on an airgapped Tails boot.

I tried using a USB with MEW.html downloaded, but Tails only has tor so I need something stand-alone. I could probably write my own if I had to, but I'd like to move my ETH off-exchange today rather than in a week or two when I've written+tested my wallet.

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Surely something like this exists. I know hardware wallets are popular, but for now, they're not for me.

EDIT: error in the title, I meant 'main' storage wallets