It’s going to be hard work to build something reliable about the need for visa or not. For me just linking to the relevant government website and other contact information would be useful. And possible a way to comment.

Info about avoiding those unofficial visa sites would also help a lot of people.

I wouldn't ever trust information from Wikipedia on something as important as visas. That you would provide this information as even remotely authoritative on your website is a huge red flag.

How are you planning to keep it up to date ?