The purpose of ERC1155 over ERC721 is the support of non-fungible tokens that can also have a supply greater than 1. For instance: a game inventory like a small sword with ID 1 and a supply of 10000, while the bigger sword with ID 2 only has a stock of 2000 items.

If I understand your article correctly, you are limiting the ERC1155 to providing only items with a total supply of 1. Why then do you use an ERC1155 and not a gas optimized version of the ERC721?