Dear student
I don't think there is any case in which a plasma and a B-E condensate mix into each other. Because the plasmas are hot and typical B-E condensates have a very low temperature near absolute zero. But if they mix into each other, they quickly cease to behave like either condensate or plasma and take on some more ordinary state of matter. They exist at a quite opposite temperature, So they will rapidly reach in a new equilibrium somewhere in the middle.
Regards