It would, however, be pretty nice if Moose could support this sort of behavior natively and have it just work, instead of requiring that sort of workaround.
Well, it has been discussed before, the idea of inheriting method modifiers in subclasses, but the determination always is that this would be dangerous action at a distance. If you want to override a method in a subclass you should not need to worry about whether one of the superclasses in the chain has a method modifier attached to it. While this might be behavior you want now, it is most certainly not a good generic behavior and since method modifiers are generic things, ... you get the idea here.
I would be interested to know what problem you are trying to solve by using an around on an attribute accessor. Often times this kind of stuff can be solved using some other feature of Moose attributes.