Looks very slick! I used QR codes and a sloppy script to back up a SSH key recently, and was dreading the possibly of needing to use said backups. I 100% will be looking into this.
Also, 100% that KeePassXC needs a better paper backup option. It's a great application, but I had a terrible time with how it formatting my notes/comments last time I printed from it. My one thing is that I want my backup to be something much closer to plain text that I could recover info from without KeePass. No encryption and no KeePass database structure.