Not a bad option, although now we need a phone with camera, a printer, a QR reader app, to name a few...
And don't let get started with usability issues of QR codes (like restaurant menus)

My idea is to make it easy to backup keys with pen and paper 🖋 📄 without copying the hexadecimal string which is prone to error 👀

@prologic @eapl.me there is nothing super specific to bitcoin or cryptocurrencies in BIP39, it can be used for any hexadecimal string. +1 use BIP39

I agree with @prologic and @shreyan don't discard BIP39 because the Crypto world is using it.
After all they're concerned about privacy as like as you are.

While talking about mnemonics (and perhaps going off tangent a bit), does anyone knows of a tool to generate a mnemonic from a password, and vice-versa?