That's a great way to mask the contents of a seed phrase, but is it really worth the risk of forgetting it?

Keep in mind that most people's hard drives are like museums with a bunch of old lost files and folders relegated to the archives section - where they are never viewed again - after someone opens them once or twice.

Decryption inevitably will store the seed somewhere in plaintext which makes any kind of encryption implementation vulnerable to side-channels (as almost everyone is running this through some 3rd party terminal or GUI).