I tried to do Pre-computed visibility (possibly my only real solution to my problem). However, I couldn’t get them to work.
I’ve enabled pre-compute visibility in my world settings.
I’ve placed a precomputed visibility volume with a visibility override volume inside of it.
AND I’ve built the static visibility in the build settings. But it’s still giving me the ‘no precomputed visibility’ warning.
The setting ‘Override invisible levels’ actually seems like it would be perfect for my setup, but I can’t get these volumes to work no matter what… 
