Thoughts:
In a front differential that doesnt have a locker (its "open"), one axle shaft will spin faster and one axle shaft will spin slower when the vehicle is turning (speed of axle shaft compared to when the vehicle is going straight). The average of these two axle shafts is probably a close estimate of the front driveshaft's RPM (after you divide by the gear ratio).
Okay so lets slap on an Aussie and take that same turn -- obviously the two axle shafts are now going to try to spin at the same speed. For simplicity, lets say the locker is locked and its not "ratcheting". In this situation, I'd say that the speed of the front driveshaft is still about the same as the differential that doesnt have a locker in it.
So, if the statements above is true, then from the transfer case's perspective, there's really not that much of a difference whether or not there is an Aussie in the front axle -- which means you probably dont need to do a BWM even with a front locker.
Your guys' thoughts on this?