I experienced a little bit in AP and I tried the following:
I made a group with two adjustment layers, a gaussian blur filter and a mask (see example). As you can see the black in the mask is hide the three layers. I was very happy. This is what I wanted.
Then I changed the blur filter for a twirl filter just to see what happens. The mask has no effect on the twirl filter. So is there a difference between the live filters here? :(
Edit: it looks like that the twirl filter is changing the mask, but in case of the blur filter that did not happen. The blur filter was still only applying to the whole background picture.
Edit 2: the live filters must be above the adjustment filters otherwise i will not work
example 2.tiff
example.tiff