Brunswick gave you top-tier advice.
I, myself fell down the sovereign citizen rabbit hole several years ago and as he said, its a road to nowhere for now.
Perhaps when your kids reach the age of work, social security won't even be a thing.
Discussion
I did not get him one. I’ve got to do a lot more research.
And I agree, it seems to be difficult to live in the world rn without a SSN, but that could change.