Pin keyframes to the start/end of a clip?

Hello, 

I have built a .mogrt (in AE) and when the .mogrt starts in the timeline, I need the footage on the tracks below the .mogrt to shift over to the left by one-quarter of the sequence width so that it the footage is now centered on one side of the screen (the .mogrt fills the other side of the screen). I'm trying to figure out the easiest way to incorporate this into my project files so that it requires minimal effort to apply the effect over and over again. 

Currently I have an adjustment layer with a Transform effect that has position keyframes on it. this can be copied+pasted and placed underneath the .mogrt, sandwiched between it and the footage on the timeline. 

This works okay — the only manual adjustment required is that when the .mogrt duration is increased or decreased, the position keyframes at the end of the adjustment layer need to be moved. 

The more "automated" solution I've read about is to include a "media" field in the .mogrt that I can drag my footage into — and then an adjustment layer within the .mogrt can be applied to the footage. However in practice I think this would be much more asinine than my current workflow — probably the fastest way would be to copy the source footage below the .mogrt and then open the .mogrt's timeline editor and paste in that specific portion... and then if the .mogrt is moved by a few frames in the sequence, suddenly my footage layer in the .mogrt is out of sync with the rest of the sequence and needs to be retimed...

What I WISH is that a .mogrt had the capability to "see" the track in the timeline below it and apply a transform effect to it; then the adjustment layer would be unnecessary. But from what I've read this isn't / can't / won't be a feature anytime soon. 

But barring that magically becoming a possibility, curious if anyone has ideas for a better workflow? Any way to "pin" the position keyframes on the adjustment layer so that they remain at the start/end of the clip when the clip handles are dragged?

Posting this in the PP community because it seems like I'm out of options for building the feature INTO a .mogrt in AE... but if I'm wrong please let me know!