It worked! I’ll look into adding an official way to do this but here are the settings to do it now:
Imprint Cutter
Blade thickness: 0.01
Imprint depth: 0
Blade depth: 2 (or however thick you want the cake topper)
Handle width and height: 0.01
and there you go:
Here is the link to that happy birthday cake topper if you want to see it and play with it for yourself