Though not having woodpecker issues, we've had chipmunks going crazy this summer. First they chewed my brick mold trim around our garage (thought I had nailed it with the snowblower), then they decided to chew through our pressure treated 6x6 steps, nice.
Wasn't interested in killing them so we tried a bunch of things to irritate the h*ll out of them. What finally worked and why I am mentioning this is this.
Rodent Control - Pest Control - Ace Hardware
Shake Away makes a rodent repellant that is fox urine based. Worked great. I've seen the spray version but could not find the link for it. I don't care if they take up residence in the rock retaining walls or elsewhere as long as they aren't eating my house!!
Maybe introducing the scent of a predator would change their mind for you.