This is similar to a system I have seen, other than the inclusion of a dense QR code as the backup, stored in a secure safe. And you need to test the entire pro

This is similar to a system I have seen, other than the inclusion of a dense QR code as the backup, stored in a secure safe. And you need to test the entire process from scan to key resurrection. We saw that our offline signing laptop's camera was low enough quality that it was very hard (but possible) to read the key, because it was so dense.