Hi Ricardo,
Have you seen EIP-2477 about Token Metadata Integrity ? This EIP may solve similar issues that your proposed new standard would solve.
I’m organising Working Group around improving the ERC721 Standard and creating new improved standard. There is a lot to improve on the ERC721 and I believe together we can create new community standard that would be better than the old ERC721. Feel free to chime in Improving NFT standard