You could:
a. Put the tracks in a separate .veg and nest it. Add the P/C keyframes on the nested object in the parent .veg
…or…
b. Make all the tracks a compositing child. Put a solid white event (of the appropriate length) on the parent track. Change the parent’s compositing mode to Multiply. Add the P/C keyframes to the white event in the parent track.
I know (a) will work. I think (b) will. Best.