Catalina AudioServerPlugIn Installation

CoreAudio/AudioServerPlugIn.h says that .driver plugin packages must be installed in /Library/Audio/Plug-Ins/HAL

However I don't know of any documentation that tells of how to make CoreAudio notice the appearance of the new driver (or when uninstalling, its absence). Before Catalina most people did something like

sudo killall coreaudiod

and that worked well. However in Catalina, this doesn't work anymore, and the only way I've found to get plugins loaded or unloaded is to reboot the machine, which seems a heavy handed approach for userland plugins.

So is there another way? Or is this a bug?