Sprite renderer to update secondary texture channel (emission)

Hello,
How can i inject a texture to a shader's _Emission map slot, depending on the currently played sprite animation clip in mecanim?

E.G.
I have a material that accept a _MainTex and _Emission



The sprite renderer automatically swap the sprite sheet in the _MainTex slot once a given animation is being played in mecanim.

I want the sprite renderer (or a custom solution) to also inject the corresponding _Emission to the correct slot.

I was thinking of "listening" to the state change in mecanim, get the clip name and then look for a "currentlyplayedclipname" + "_emissive" .png, and finally apply it to the _Emission slot.

Would this work? Any other ideas?

Thanks!