[boost] Boost.Threads, N2178, N2184, et al

Hello everyone, I'd like to start working on a Boost implementation of my threading proposal N2178: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2178.html but, as you'll see if you take a look at it, it differs from the current Boost.Threads and Howard Hinnant's competing N2184 in a number of important places, and having two competing libraries in Boost that do the same thing may not be a good idea. So what would be the best way to proceed?