Yes, I understand. I have done that before, but not with building keys.
I am pretty restrictive about adding layers to our dwgs. (I manage our CAD dwgs). We had some pretty horrible layer issues in the past and have set standards for layer use. If you saw our type of dwgs, you would understand. They are very non-typical. Because of this, we keep layer numbers to a minimum. Your multiple layers gives me pause. My wipeout uses ONE layer & easy to understand by Non-CAD professionals (Engineers).
Your way around the barn seems to have more guard dogs than mine. Like what you said earlier, it works for us.