You can encrypt the wallet with AES256, encode the wallet in BASE64 using some easy-to-parse computer font such as Courier New or System (they must be monospaced so they can be perfectly read again using OCR), and then print out the characters onto a large number of sheets of paper. Then you save the AES key and IV as qrcodes. Store all materials in a confidential place such as inside a safe.
That is a reasonable solution albeit a kind of expensive one in terms of materials/resources used (ink and paper and physical storage space). I think encoding into the base 64 is going to increase the filesize and increase the number of papers it takes to print the thing out. but you did say "large number of sheets of paper" and you're right about that. it's not going to give any shortcut in that area. the other issue is there's no fault tolerance built into it. Yes presumably you would test to make sure that it scanned and decrypted fine before you put it into a confidential place (who wouldn't??) but maybe some of the characters were marginal and got corrupted over time and you would have no idea which one or ones and what they were supposed to be and you would be in big trouble.
So while your proposal seems reasonable, in some ways it is not the ideal thing. Thanks for mentioning it though.