Snakes don't even care that much for bonding with their own species unless it's mating season, much less a cat. There's no reason you shouldn't be able to handle the BP when the cat is around; I do it all the time, I just make sure my furry pets are in another room and close the door.

As for the rubbing and staring; both are probably signs that the cat is interested in chewing on the snake. But neither matter so long as there's no way for the cat to get in the tank, and the snake has a place to hide and feel safe.