How can I keep a package but discard its configuration?

I know I can use this to remove a package but keep configuration:

sudo apt-get remove $package

I know I can also use this to remove a package and discard its configuration files:

sudo apt-get purge $package

But what if I want to keep a package but discard its configuration?

^{Context: I did something wrong with Network Manager and it's started segfaulting on a loop, and while sudo service network-manager stop works, I also kinda want to use WiFi. If this was just any old boring package, I could just purge and reinstall it. That's obviously not an option for Network Manager, since ubuntu-desktop depends on it.}