OK, I think you are asking the following:
Can you connect Receiver ----
Birdog -----Motor ----- LNBF?
I don't see why not. You can still control the motor using the receiver, and verify the signal using the Birdog.
Another way you can achieve this is if you have a dual output LNBF. Then you can connect the meter to the second output on that receiver.
I have done the following in the past and it worked fine:
Birdog----
MP01 ----Motor ---- LNBF
The meter supplied the motor with power and the MP01 provided the DiSEqC 1.2 to move the motor. I aligned a motorized dish just like that without even using a receiver. Notice that this will drain the battery fast, so you really need to be fast and know what angles you need to setup the motor/dish.