A swing axle car is not any more or less likely to flip because of ride height. In an extreme corner, the outside suspension is forced to extend into positive camber, then the tire digs in and you flip.
A compensator won't fit on my Vintage Spyder, so I have nylon limit straps that prevent too much positive camber.
A factory VW Z-bar was 1968 only, and IMHO was somewhat useless. An aftermarket Z-bar can be very effective. There is a guy in my Vee group who runs a 1970 Caldwell D-13 with 2 shocks and a Z bar. He is usually in the top 5.
But for my money, I'd just buy the CB compensator. You don't have to think about it, test it, or tweak it. Just purchase it and bolt it on. It's your life, though, not mine.