Hi Robert,
Yes, you've got the idea of what I want to do.
I'm a programmer, so I could do whatever conversion is necessary but don't have access to the 2D motion output yet. But, I think your idea is sound to convert the 2D to the 3D...
In use, Motion 5 will track a point on the 2D plane, but it also gives me scaling and rotation so the result should be something like 2.5D... using scale for a partial Z... I'm thinking once the heavy lifting is done in the motion file - I could fine tune in A:M (as objects that I wish to animate will need to cross paths, one behind the other.)
Rendering in A:M with an Alpha channel and bring it into FCPX and I should be good *IN THEORY*, but I don't have A:M to try this... so, was hoping someone may have come this way before where I could benefit from their knowledge.
The effect is certainly powerful...
-charlie