Escalator animation - moving collider loop

Hey guys,

I'm currently working on an architectural visualization, and I came across a little issue.
There's an escalator in my scene, (model led and animated in C4D), and to optimize it, I made a looping animation of 90 frames (5 steps), which allows me to delete the steps that we don't see as well, because they never "make it out of the ground".

The problem is the collider of the escalator : after 90F, the FPC always gets back to the initial position, so it never climbs up more than 5 steps, and will never reach the top.

Do you know if there's any way I could fix this, which doesn't imply having the entire animation of the escalator (around 900 frames and twice as many polygons)

I'm not sure i made it really clear, so I upload here the Unity package of the escalator animated so you may understand what the issue is, here (The file was too big for the forum ._.) ==> https://www.mediafire.com/?xzsnj83x4jyb117

Thanks,

Grop

 

Guys... Please?