The only way to do this would be to have two Catalogs and those two Catalogs cannot be open at the same time. When you wish to switch from one to the other, LRC will have to quit and restart. This is not horrible and I do this occasionally as I take photos of an organization and I didn't want those photos in my regular Catalog. So, I have two Catalogs and go back and forth as necessary.
If this is OK with you than the answer is Yes and now you know how to do it. ;>)
Oh, one other point: facial recognition does fairly well but it's a learning process. In the beginning you will find some suggestions comically bad. But it gets better and better and after a while becomes quite good.