This is not how these kinds of things should be designed for the web. Instead of putting resources in the root of the web, this is what /.well-known/ was designed for. See RFC 5785: https://datatracker.ietf.org/doc/html/rfc5785 Instead of munging URLs to get alternate formats, this is what content negotiation or rel=alternate were designed for. I’m not sure making it easier to consume content is something that is nee…
If only this RFC was well-known among the people who actually put stuff out on the Web.
Certainly more well used than content negotiation which grandparent also mentioned.