There is no point backing up your seed phrase and passphrase on the same piece of paper, since then the passphrase is adding nothing.
That's not entirely true: this scenario still protects you against a
$5 wrench attack: the password gives you plausible deniability if the Trezor also shows (much smaller) funds when used without password. But indeed, the password doesn't protect you against an attacker who finds your backup if it's on the same piece of paper.
Put a little bit of bitcoin on your non-passphrase protected account, but deposit a little more on the passphrase-protected one and store the same passphrase together with your seed. That way it looks you don't really know what you are dong. At the same time, the majority of your coins are on a different passphrase-protected account and that passphrase is written down and stored separately from the previously mentioned examples.