Yes, i do think that is a good idea; I actuall printed out some QR codes, but i forgot about them so they stayed in my backback😅.
The pdf is great, but you can also print a qr code containing nostr...
1 thing irt the pdf; you talk about 'accounts', my personal suggestion would be 'Profile' instead of 'account'. In order to get some distinction from how platforms work. But its not the end of the world :)