SHE’S in NY. Pardon me for insisting on my preferred pronouns. Lol
Uh, you're not making a big enough stink then. You need to go around local to national and piss off local. Not kidding. Local will come to you and complain about the chain-of-command, but what they will be really worried about is that you will inspire others locally to do the same thing. You want to get your union to actually represent your interests, brinksmanship is the only way.
And I don't care if your union knows you are hostile to them, you go right ahead and use their resources and demand they provide a lawyer or you will go right back to national and make a YUGE stink.
Also at this point, you need to become a diarist and write down every single thing you have done or has been done to you regarding this challenge from county, from the moment you found out the county administrator made this illegal ask. Your eventual private lawyer will want a timeline front-and-center.