I wouldn't want you to live in fear. If you can pin down the hour they might visit, go out shopping. If you are home, don't answer the door. That worked when all of US used to go knock on doors, didn't it? I mean, how long would we have waited at a door that no one opened, even though we heard people inside? We used to mark on the territory slip "HBH" (home but hiding). They can't DF you for being in the bathroom, can they? (Actually, you'd be killing two birds with one stone, that's where their advice belongs....) Oh, SORRY, I was daydreaming.
Why can't you be home with a migraine? In the shower? Whatever? They think they are super, but they can't see through walls. If you open that door, you will probably get the test question mentioned above: "Do you still believe blah, blah.....?" Then you might say something or I've even heard that those who won't say "yes" have been DF'd. Why give them anything to work with? You said you weren't ready to leave yet. So don't let them have any chance to do you in at this time.
You could have a friend over that they don't know and he could dress up like a priest. Have HIM open the door with bloody hands and say "Come back later after the sacrifice is over, okay?" or "You better move off the porch. The exorcism is almost over and we expect the demon to hurl himself straight out the door." (Or anything else you'd get a kick out of.)
I live in Florida. I would put up a sign: "Our pet alligator/snake/scorpion is missing. Please do not approach the door." But put the sign ON the door, so they can't see it until they think it's too late. That would be fun watching them sprint for the gate. Or "Our bipolar son is home again. His father's .45 pistol is missing. All visitors should leave NOW." Have some fun with it.
It's your home and life. Play it the way you want to. THEY are the uninvited people. (Like they usually are.) Don't give them any power over you. Good luck.