I have no idea if this is the right thing to do or not, but if I was in that situation here is what I would do.
I would cover the inside of all the walls with a chicken wire mesh, and then cement over the walls with a couple thin coats of cement. That way I could level the surface, and seal it as much as possible.
A friend of mine has a house in philly that has huge rodent issues because the foundation is so bad that there are literally large holes that are bored through it. Because he is renting the huse he just took about 7 cans of spray foam insulation and foamed all the holes
He later said he could hear the mice trying to eat away at the foam as they died.