Is the git from cdesai above the same project or is that just a pointer from someone working on a similar project?
It looks like the distribution method is up in the air, but I have a framework that could probably port the changes over other ROMs for the Nexus. It would just depend on what changes are included in your code.
If you have AOSP or CM10 with only the WindowManagerEdits (or, at least only edits related to UI changes) then we could likely put together a patch that could made into a flashable zip and applied over most ROMs for the Nexus 7 (at worst, we would need one patch set for AOSP, CM10, and possibly AOKP, if the demand necessitates it.)
Then users could just flash a zip with the UI changes applied, thereby having the UI choice in any ROM of their choice.
You can see the framework in the link on my sig. Works pretty well.
I ported Paranoid Android to Nook Color, and I am working on creating a patch set to apply PA to the Nook's nightlies. It is difficult since PA is closed source at the moment. But your project should be very doable, should you want to investigate this manner of distribution.
With PA, there are a bunch of changes that are device-specific, which limits the portablilty. We'll have to see what you come up with here, but since Nexus 7 has such a large user base, device-specific patches have a lot of value.