I’m not just saying this flippantly, as I can garner enough info from our past interactions to give specific-enough advice. You should join the public sector union. I know past and present members closely. I have a trans friend who got their help getting a manager who wouldn’t use her correct pronouns reprimanded by HR. My mum was also a member for over a decade.
I completely agree with where you’re at, and I’m really sorry that you’re living with this fear. I do believe though that a strong public sector union, with queer members in its ranks, would be capable of fighting the government on it. The construction union where I’m at showed up in force to protect trans folks from the alt-right at a TDOV rally.
My experience with my union hasn't been great. I was a member, and when I needed their assistance (not about anything trans related), they were completely non helpful. They brushed me off, asked for my employers version of events (airing my grievance with my employer without my consent), and then closed the issue down as soon as my employer gave a reply.
Here in Spain we just got a progressive left leaning coalition government... that right the other day split into a "trans-inclusive feminist march" and a "trans-exclusive feminist march", with the populist right-wing addon march of "the country is breaking apart".