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Motion vector AOV for VDB pyro sim in Arnold(maya)

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Does anyone know how to get a motion vector AOV for a VDB pyro sim in Arnold (Maya). I know the smarter solution would be to use Arnold for Houdini or to just use Mantra but I have no control over this pipeline. The VDB MUST be taken into Maya to be rendered with Arnold, and I MUST do motion blur in Nuke using motion vectors.

I'm aware that in order to get motion vectors out of Maya I need to turn on motion blur in the render globals and make sure 'ignore motion blur' is ticked in the render overrides - I can render motion vectors for geometry and fur without any problems but I can't figure out how to get motion vectors for VDB's.

Hopefully someone out there has had to deal with this before. Any help is appreciated, thanks.

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