At the very least police cameras need to be rigged to a switch in the gun holster - it turns the camera on automatically if drawn. Not sure how feasible that is, but it doesn't seem unrealistic to pull off.
Plus a whole bunch of other stuff - like not only rolling back qualified immunity, but also the stupid interpretations that prevent victims from suing the department or city as a whole when lives are lost or homes damaged for tens of thousands of dollars. The overpowered protections remove any incentive for proactive reforms - meaning someone (or most likely several someones) have to die before anything is done.