Unpopular opinion: donāt store your backup seed phrase separately from your device. This creates a poor-manās 1-of-2 multisig, where access to either gives you the coin.
If you want 1-of-2 multisig, then set up genuine 1-of-2 multisig with two different seeds on two different signing devices in two different locations.
Just add a strong passphrase that canāt be brute forced.
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The device can't attest for its firmware integrity. There are many issues with that design. Including a ton of Shitcoin.
I donāt use Trezor but passphrase seems like a must regardless of signing device used.