In order to see if my previous worries would be a problem, I devised a test to see if my QR code idea would still be viable. The first thing I did was create swatches using the ICC data supplied by Fedrigoni, and overlay a simple QR Code leading to the Fedrigoni website as a test:
These were then printed out to the same size as they would be on the finished calendar and then separated to ensure accuracy.
I then went through each square using the app 'Scan' on my phone.
Once the code successfully scanned, the app immediately redirected to the Fedrigoni website via a url shortener to keep QR code size and complexity down.
Results: Almost every QR code scanned perfectly the first time/within a few seconds. The only problem was with the red square which took very slightly longer to scan due to its very bright hue.
I will test again once the designs have been printed in full.