This sounds kind of similar to something I started working on years ago, but never really shipped in any meaningful way: <a href="http://dentedreality.com.au/projects/htfs/">HTFS</a>.

I suffered from the same issue of rewriting the prototype a few different times, in a few different languages/approaches, and never really seeing any of them through far enough to know if it'd be truly useful.

Hope you get yours shipped, for purely selfish reasons!