After Effects :: Continuous Rasterization Of Vectors Inside Nested Comps

I've got a bunch of comps that contain vectors animating. Inside the comps, the vectors are set to "continuously rasterize" which means that they come out nice and smooth no matter what the size.
 
But I need to use these comps inside a larger composition, and I'm moving the whole comp around the screen with motion blur on it.
 
But when the comp is set to "Collapse Transformations", motion blur is disabled. If I turn off "Collapse Transformations", it appears to over-ride the settings inside the comp, so none of the vectors are smooth. They all look like pixel-based images that have been scaled up. Horrible.
 
I don't get it. I need those vectors to be crystal smooth, but I need the whole comp to have motion blur. How do I achieve this?
 
This is a 2D question, I'm not using any 3D at all. I've read the relevant sections on Continuous Rasterization and on Collapsing Transforms and, as is the case with so much of this Adobe documentation that I'm being referred to, it does not address my specific case, though I can't imagine it's that uncommon.
 
PS: I can't denormalize the hierarchy because of the way the animation has to work - the animation itself is hierarchical, therefore the content must be structured in a smiliar hierarchy in order to work (think moons orbiting planets orbiting the sun)