This is terrible security advice. You literally cannot not connect the phone to the internet; the offline signing wallet app must be updated directly over the internet.
Scanning QR codes is the most secure way to share signed transactions. It is an example of a scoped communication protocol, it can only communicate what you want communicated. You want an offline signed that cannot communicate beyond a narrow scope and only if the device is physically with you.
Jumbling up the order of your words, in any way, has no security benefit and only risk. If you want a portion of your security setup stored in your head, use a bip39 passphrase. General rule: anything you can think up to mess with your cryptography is just added complexity with a larger chance of failure and no security benefit.
A phone with a wallet on it is not a cold vault. A purpose built signing device with no wireless networking capability is.