I would hate to see you pull out an established plant that hasn't been a problem in years. Sounds like you've got the perfect location for it. Just don't let it spread from there.
Cat claw looks great when it's happy, but the one I had when we lived in the foothills would go dormant or freeze back in the winter. It was right near the back door and I was always getting caught up in the little cat claws. They're grabby little things. If they're out of the way where you can admire them from afar and they have nowhere to go to get into mischief, they're great plants.
