VRay Instancer using PFlow Particle Age material maps

[jdrouse]

I have a PFlow system that uses particle age to fade down a particle over time. In the simplest case, fire embers that turn from orange to black.
I have many of them and can't render them with VRay motion blur turned on, it crashes immediately. So instead, I use VRay instancer and it renders perfectly fine with motion blur but I can't obviously get particle age to work since Instancer is not aware of particle ages.

Is there a solution to getting particle age to work?

Or to check what I'm doing to get pflow with motion blur in vray...

thanks!