The problem you have is that by defining a "FUN" standard, you've probably created a basin of attraction [1] for what is basically the web today. It doesn't take much before you've basically let the ocean in.
There are clearly many points between Gopher/Gemini and the modern web... but I'm not sure any of them are stable. Between the difficulty of keeping out features in a principled manner in what will inevitably become a group effort and how easy it is to accidentally spec something that turns out to be a lot more complicated than you thought it was, you're pretty much working in a space where the Horrors of the Web are lurking just outside your door, and you'd be surprised which missteps will let them in.