You could do the fork yourself (it is two or three git commands), but I am sorry you most probably won't find competent people to work on it for free and enough keep it both current and secure, as this is a doomed endeavour. I guess it would be easier to hire a tripulation for a leaking ocean liner which is doomed to sink on its first journey.

And it becomed even more of a challenge if you want to use a web browser, as these things evolve not only in terms of many security fixes, but also in terms of features, and a browser version that is ten years old is not useful today for things like banking or online shopping, and most news sites won't even display.

And I say that as somebody using a pretty conservative and minimalist stack.

And if you say you don't need security - why not install a kernel from 2021 with a browser of the same age, and disconnect it from the Internet? If it is connected, it most likely needs security.