Peter,
I think you are right, but only if you are planning on fitting and forgetting. Surely you would check your fluid levels on a regular basis (eg before and after each track event and during regular servicing)? I used to check the discs and calipers after and before each event, but I used different pads for track and road.
As the level goes down, can't you just top it up?
Is the volume of the brakes you're running any or much bigger than those on a patrol?