Have you tried using "Filled Region" under "Drafting". It will only be
visible in the View you place it in, i.e. "Framing Plan".
It's fairly easy to do. Just select "Filled Region"; sketch the area you
want filled, select the "Region Property" to set your fill (edit/new) to
change. OK out and Finish Sketch.
The only problem I've found is a "Solid Fill" does not display
"Transparent"; even if set as transparent; but all the other drafting
patterns will show transparent if set to transparent. Try using "dense
sand" in black or some other pattern.