This book is a core text on this subject, which explicitly considers when specific agencies are effective and motivated to pursue particular goals: https://www.amazon.co.uk/Bureaucracy-Government-Agencies-Basic-Classics/dp/0465007856
I’m also reminded of Nate Silver’s interviews with the US hurricane forecasting agency in The Signal and the Noise.
One issue to consider is whether catastrophic risk is a sufficiently popular issue for an agency to use it to sustain itself. Independent organisations can be vulnerable to cuts. This probably varies a lot by country.