Layered Image Files in Motion for FCP

Up to this point, I've been using Motion (3.0) files in Final Cut Pro (6.0) to create slates for my projects. We do a lot of slates, so the render time for the various slates adds up. Sometimes 40-50 slates in a single timeline, which can result in hours of rendering. I can't export each slate as a flat image because I often need to go into the slate and make some edits.

I noticed that if I use Photoshop, I'm able to drag layered TIFF files into my FCP timeline to create much shorter render times (the light green "preview" render line instead of red). And, since the TIFF file remains layered, I'm able to edit text in the slate in Photoshop and have the changes show up in FCP automatically.

Problem is, not every editor/producer here has Photoshop, but they all have Motion. Is there a similar way to do the same thing in Motion that I can do in Photoshop while keeping those renders "preview" (light green, rather than red).

Hope this makes sense. Please let me know if you need more info. Thanks!