I think it could be useful to collect this data, both for administrative and research purposes.
I’m unsure, currently, exactly what data should be collected by the censuses (that would be proposed and discussed here). The data that is collected, should be collected anonymously. Furthermore, participation should be entirely voluntary.
I could certainly be misinterpreting, but your statement seems to imply that the census is intended to be non-anonymous and that it won’t be publicly released. For clarity, I am proposing a census whose data is anonymously collected, and will be publicly released by the admins once completed. Although, from this statement:
Perhaps you don’t trust that they’ll release the data? If so, perhaps there would be a way to publicly host the data live as it comes in?