Controlling layers with identical animation but scattered over timeline

Hello.

I'm in a situation where I have around 700 layers and all of them have identical animation - a small position and opacity change. The problem is that they are on different places on timeline and it's a pain if I want to change the keyframe values/length.
Maybe there is some smart way to make the control of the animation easier, with sliders perhaps?

The easiest way for me at the moment is rearranging all of them to 0:00 second mark / deleting keyframes and creating new ones, then scatter them using a script but it takes a while and is pretty heavy on resources.

Thanks