Sorry to reply as late, thank you for your answer
You simply can’t do that
You would need to rewrite Blender/Bforartists to implement another UI solution. And then you would loose all the addons. Which is fatal, since even the renderer Cycles is an addon. What can be done is some modifications, in the bounds of the Blender UI solution.
i think it is possible to adapt to work as interface but of course it needs to change to take this consideration from UI. Think BI on how to integrate in.