GL sockets, when filled, glow the color of the stance you're in. Simple as that, really. No need to complicate it.

Every time you change stance it shimmers so that you can tell you've executed a stance change. Instead of putting more numbers to look at, there could be a flashing effect to show that you're at risk of dropping a stance. At the same time, I'm not sure MNK really needs that (or any more) information in the Job gauge.