I'll volunteer to do this for Lua. Which browser vendors do you have on board? Perhaps we can teach the world that "Asynchronous code" and "Seven nested callbacks" are not synonyms.
After you do that you have better chrome than Google does and you can start distributing it. It's in fact doable, once you have a set of patches, to reach some audience with that build.
Problem is, surprisingly, nobody does! And the sandboxing would be huge too.