Random by poly shell not working with vray proxies ?

[cgdom]

I'm trying to randomize color on a bunch of objects coming through an .abc that's being loaded via a vray proxy. The sampler info node with the vray random by poly shell extra parameter does not seem to return any values. Was it ever meant to work with proxies ? It does work when the object is loaded as a reference into maya but then I loose some of the functionality I'm getting out of the proxy object.

Is there any way to make this work ?

[hermit.crab]

It won't work with proxies since the .vrmesh conversion does not store such information. What can be used as an alternative is the Random by Name, where each object has a unique name - this works with both the new and old proxies.