Is it possible to use QR codes to save keys?

Question

linux

Goal: keep pgp/ssh-rsa/btc rsa in a safe place in the easiest and cheapest way.
Possible solution: use qr codes.
Problem: gpg --export-secure-keys --armor generates about 8kb of data. Qrencode on Linux refuses to encode such a data size, although the specifications for qr codes indicated larger sizes.
Question: do I need to write my own tool using any that can encode a given amount of data, or have I missed something?

Answer 1

Do you understand that this will be a very large QR? What specs are you referring to? The maximum QR (ver.40, 177x177 cells) contains less than 3 kB. www.qrcode.com/en/about/version.html
Why armor?