You are doing really well RB - seriously, you have it together.
I also have a glass piece in my front door and I really like it, I never open the door haha (people do not show up here unless invited, it's a thing). So when people selling stuff etc come to the door I talk to them through the glass.
The funniest part is some of them pretend they can't hear me. This is a seller "trick", I guess they expect me not to notice that I can hear THEM. If they keep it up I just walk away - not very friendly - but anyhoo, the curtain is a great idea.
Good luck tomorrow, what a ridiculous deal he tried to make there, very underhanded.