Thirdly, if someone wants to rob you and comes at you with knife on your neck, then your method is not gonna help to keep funds safe because in order to save your life, probably you'll have to tell the truth.
All more reason to use a passphrase over the system being proposed here. In the event of being subjected to a $5 wrench attack, then you can reveal your seed phrase to the attacker, and they can steal the small amount of coins that you have stored in the base wallet. However, the majority of your coins which you have stored in additional secret wallets which are hidden behind one or more passphrases remain not only secure, but completely hidden; the attacker has no idea they even exist.