I'd work on switching around the keycaps and mapping this keyboard input to a virtual keyboard via drivers. I will try and think of something, this should be interesting.
EDIT: Found it! SharpKeys
So I took this first shot before I really did anything (photos from phone, at night, sorry for noise):
As you can see, this is a regular QWERTY layout.
Installed SharpKeys, and started mapping the letters from the QWERTY layout to the AZERTY layout.
Ended up with this as a good start:
Wrote to registry, logged off, logged in.
Switched some keys around.
Obviously, they aren't the same shape, and they don't fit in flush with the rest, so you might need a keycap set with AZERTY in mind. Try WASDKeyboards, it might be worth it, you'd get your own designs, laser-engraved, if you do not find a ready set or want to do a special set (awesome).
But, however, success:
Good luck with what you're looking for.
Edited by yasamoka - 4/17/13 at 4:28pm