I didn't have much luck with UNtraining my guineas to stop using the coop.
I would lock them out each night which meant I had to stand there at the door as each chicken went inside in the evening and shoo the guineas away.
They just flew up to the top of the run and roosted there each night. I wish they would have chosen the trees or the beams inside the pole barn, but they didn't.
I figured a few weeks of this and the guineas would stay outside.
Some of them would stay outside and some would still come inside the coop.
Eventually, they all came back inside the coop.
I ended up selling them all since I had 20 guinea eggs hatching.
This time I raised the keets up in the large barn so they could roost up in the rafters.
I open the barn doors during the day so they can go outside.
My plan is to have them eat up all the bugs and worms in the pastures there to help minimize the worm load on my livestock.
So right now I have two guineas inside the coop; but they were both raised under one of my broody hens (a Silkie) so they are quite gentle.