Yes, all this is fine. The transmission are virtually the same for both BMW and Ford. Also, if you think the Ford pan is fine for the BMW, why not use the "SP" fluid that Ford specifies for the transmission and stay away from the Lifeguard fluid? Same logic right?

For me, I stay with the BMW pan as I don't want confusion for the next person that may work on the car. And, I use the "SP" fluid or equivalent.

Each to his own.