I think BLU should have DF access at least - but rather than them put into normal parties, the BLUs can be matched together. So, if you queue for Haukke Manor, Aurum Vale, etc as a BLU, you get matched with all BLUs. They could even do the roulette as well, same matching. That way, BLUs aren't interfering with the normal party formation, but still have a way to get into duties.