cryptomatte for refracted objects

It's not possible to use the cryptomattes on objects/materials which are behind glass. Would be great if the refracted objects could have a suitably distorted (dependant on ior) cryptomatte, of the same ID as the non refracted parts of materials/objects.

This would be handy if for example you have two identical chairs, one in the open, and one behind glass, but you want to change the colour of both in the compositor.

Of course this would require that all objects which have a material with transmission enabled would need to be excluded from the cryptomatte, or better still have a seperate cryptomatte just for transmission materials so as not to complicate matters.