Kind of a shower thought, but I think it could work in certain hostile real-life workplace/social situations. Basically, if people ever accuse you of being "cis" or a "terf" or demand to know your pronouns... tell them you're agender and that THEY'RE the bigoted ones for assuming you're cis.
It's not even a lie because many of us don't believe in gender, just biological sex. We are literally "agender" in their eyes according to THEIR definition of having a "gender identity" or not.
If they continue to ask for pronouns, say that's a microaggression against you as an agender female/woman because you don't believe in picking pronouns for yourself.
If they ask you to extrapolate on what you mean by agender female/woman, say that's a microaggression and that it's not your job to educate them. Call THEM the bigot for not respecting your self-identification.
I've been doing this IRL for years in order to get my gender abolitionist points across and can say it works. I also put gender nonconforming before woman/female when asked how I identify, because I do not identify with a sexist set of rules. You can have TRAs agreeing with radical feminist stances on what gender is very quickly and it will get her thinking the next time she's told some sexist crap about womanhood.
This rarely causes issues but if by chance a TIM tries to come after you for invalidating him, then you can play the "wow a binary trans trying to impose the binary on non-binary, nonconforming and agender people" which isn't even wrong by gender logic.