You can't solve a culture of pervasive government surveillance by inventing new tech, because that tech will just be outlawed or regulated to death (see the UK online safety bill). You have to change the culture that makes governments think they have the right to see everything.
I call bs. New regulation moves slower that the rate at which people can find workarounds
You could setup something like "Circumvention of facial recognition using dedicated technical devices at demonstrations is considered disguising at a demonstration and follows the same laws" in germany.
And sure, this would result in a lot of lawsuits, discussions, escalations through different courts while the regulation is being tested - and it might be struck down entirely - but it would stand for a while and strike down _all_ workarounds.