So this happened over the weekend:
The squirrel did not survive and the same can be said about the lower grill.
I haven't called Nissan yet to get a price on what a new bumper and painting will cost. It just kind of sucks that the lower grill isn't its own part like the upper grill is.
Depending on the costs I may get the bumper replaced or cut out the remaining lower grill and replace it with some other material. I'll post updates if I go that route.
-Ian