Ampede has a $99 plug-in called “PDF Plugin” that allows for continuous rasterization inside of FCP.
“…There was a time when continuous rasterization was only available in high-priced compositors like Adobe After Effects. Now, Final Cut Pro editors can take full advantage of continuous rasterization without leaving Final Cut Pro by using Ampede’s inexpensive PDF plugin.
Ampede PDF is a fully-integrated Final Cut Pro plugin that renders vector content from Adobe Illustrator(1) and PDF files frame by frame, so the image is always sharp regardless of scale, movement, or rotation. Vector content can be seamlessly mixed with QuickTime content, and the geometrics are fully keyframeable using the standard Final Cut Pro interface you already know how to use….”
Hope that helps.