Thank you for the replies. Yes, the blanking feature ended up working well. The only caveat is that it is not stored as a lens position memory so you do have to play around with it in between films sometimes.
As far as screen size, I'm already running a 158" screen. I'm pretty much limited by ceiling height at this point since I have 8.5 foot ceilings.
As far as other viewers, I agree, most people don't seem to notice. We watched Dunkirk and out of the 4 total people watching it, I was the only one who noticed the aspect shifting.