Deleting the corvid tokens appears to remove them entirely from the game. They are not obtainable from the “pieces” menu.
The module that’s posted has a quite a few usability problems.
I’ve been hacking away at it for awhile now, getting it to a state where it’s tolerable. If you want to try out my version, it’s here: dropbox.com/s/z2mc4h355iemk … .vmod?dl=0