I have kind of the same problem.
I created an adjustment layer and applied some fusion stuff to it (a polygon mask and a transform with keyframes to get a transition animation) because I need this animation to be applied to a few tracks below it (one solid background and a few Text+ nodes on top).
The clip below (a video of me) should stay unaffected because I want to "pull down" the new clip (the solid background with the text nodes). The transform node is for the animation and the polygon mask is to cut out my hand to make it look credible.
But using an adjustment layer would also affect the clip showing me, which should stay in the same place.
Not using an adjustment layer is not an option since I need the same mask and the same transform (with a bit of keyframing) on 9 tracks... which would be insane.
Any other idea how I could solve this problem? I mean, something like this has surely been done before by other people, but I have now idea, how.
Thanks in advance for your help
Thomas