CrossRoads:
It is available on 24-pin wide SO surface mount package - its just a little thicker than you wanted.Or as bare die if you wanted it really thin.
A bare die would be great, though how would I go about soldering that (or having it soldered for me) in a cost effective and simple way?
Edit: I just did some googling, and it I think the bare die would be overkill for this little production run.