Look at special types for each tribe like here:
I would add an entry for recycling centres, though now when Im looking at that, there are no "special buildings" in the file, so perhaps this must be discussed with Gun if this is possible....
Anyway I believe you got what I mean..
Oh, I am blind! there is the line:
barracks = "barbarians_barracks",
so the same thing for recycling centre should be possible..