we Have excellent success at deterring woodpeckers from wooden and stucco houses with a properly placed windsock that is bright, colorful, and has several tentacles that flap in the wind. But you have to hang them right where the bird is pecking. Once it’s up there, they won’t come anywhere near it. The problem is always getting them installed on a chimney chase that comes directly up through the middle of a steep roof........ but anyway what I was getting at is that maybe you could get some installed on short poles along the sea wall and maybe a few out in the yard. Something that MOVES is always better than something that doesn’t when you are trying to scare birds. I’ve done wildlife management for over a decade and learned from two guys that have done it for over 3 decades. Fair warning, most of what you read about wildlife management on the internet is COMPLETELY wrong, not sure how it spreads like it does. Luckily, bass Resource is way cooler than the rest of the internet and you found someone that has experience actually dealing with the problem you are having. If the coyote is cheap maybe try it but I’ve seen them fail many many times. Maybe call the local DNR and ask them what your options are, although depending on who answers the phone that might be about as useful as a fake dog
