Hard to say...could Bear be put on a mild tranny so he doesn't stalk her?
I am sure you have done the blacklight/deodorize the pee spots. Just a suggestion: get Bear treated (even try a mild tranny for a couple of weeks), find all the pee spots you can and neutralize them, and THEN try letting Cami out and gradually reintegrate her.
I think dealing with Bear's attitude might help. Or - he should be the one in the room. Is Cami the only one he bothers?
I am sure others here will have ideas too!
"Remember that children, marriages, and flower gardens reflect the kind of care they get." -- H. Jackson Brown, Jr.