When i was heavily farming syndicate (4 syndicate maxing), i used to have the A appearances for my main syndicate and duplicate (please, add a duplicate appearance button ❤️ ) this appearance to B with a secondary syndicate...
So, yeah, for me appearances A & B of my let's say 10 main frames, are the same, they just serve to switch between syndicate.
It helps, but it's not optimal :
you have to check the actual syndicate you're wearing (if u can see behind the syandana, it's cool, but if not, you have to check the appearance menu)
leading sometimes to play with wrong syndicate (if you didn't check before)
At least, some icon somewhere, reminding you for which syndicate you're gaining standing, would be cool.
But yeah, separating the syndicate standing from the frames & appearances, would be perfect !