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.
When you want to access the file again, read the papers in with a scanner, strip all whitespace and then decode the AES256 with the key and IV you have independently scanned. Requires a lot of paper, but it works.
At first glance the above method seems to sound doable and promising however, iit does have some issues. one of the main ones is that there is no way that any piece of ocr software can "perfectly read" the characters off of a printed page.
In short, if you preserve your data well, you might end up having to hand-type it in to restore the unencrypted version. Assuming you can do that and don't mind doing that then this method could possibly work.