Also, you don’t need to write it down correctly, if you remember what’s the missing or different or fake bit. And you can write down a few decoy ones next to it. Or have it in two different places. Lots of room for obfuscation along with some good old fashioned physical security on where you store the note. And the backup note off-site, if you’re that kind of person.

Hell, just make some extra decoy ones just for fun and practice.