As far as I've understood by quickly skimming it :

- this is about Firefox OS being able to use "bluedroid" as its BT daemon (like most android) instead of "bluez" (like any full-blown GNU/Linux), to make the life of potential community ports easier.

So it's basically the reverse.

What you would need is the opposite : make BlueZ show up as "bluedroid" inside aliendalvik to android apps

Which currently hasn't been done yet.
It's not impossible, just not done yet.
(It's an effort that will also be useful for other android compatibility layers, such as andbox)