I'm in the same boat .. I got so involved in making new QR codes and put off entering the competition, and missed the end date for the competition
I suppose it's always possible that they might release the items again in the future but I wouldn't rely on that .. if you /really/ want it you could get someone who has the items to create a home including them, and upload it to an amiibo card that they could send to you. Then when you use that card you'd unlock the items in your game (hopefully) .. it should work anyway
I plan on doing that at some point in order to get the items I missed, so hopefully it works.
Come visit my shop! Suggestions for new stock are welcome!