Is it possible to use Google Cast SDK for Unity on device with custom android OS that does not include google play services?

[Marcus757]

I will be trying to cast from a VR device that has a custom android OS. The manufacturer of the device is telling me that I will not be able to cast with google cast because their custom android OS does not include gms (which I’m assuming is google play services). But, I saw in a sample project that the google play services jar gets added to a Unity project when you import the google cast sdk Unity plugin to a Unity project. Does this mean that I will be able to cast from this VR device even though their custom OS does not include gms (google play services)?