There are concrete examples in nature of cooperation based on mimicry. The classic example is the cuckoo. Cuckoos mimic the eggs of their hosts - often in considerable detail - in order to elicit cooperative feeding behaviour from them. The mimicry is necessary - since the hosts employ kin recognition based on egg shell traits in order to identify their own offspring. Modifications in the host eggs are eventually copied by the cuckoo lineage - proving that genuine copying is going on.
Kin selection is clearly involved in the mimicry of the cuckoo - but most would characterize it as a case of kin selection gone wrong - since the benefits go to non-kin.
An alternative analysis looks at relatedness between the copied egg shell traits. These have managed to extend themselves beyond the host species, by copying themselves into another species - thereby gaining access to the resources of a different niche. Since many host eggs perish for each cuckoo egg, this might not seem like a good deal for the trait - but such spreading between species often turns out to be a smart move in the long run.
Of course, mimicry also happens in human culture. For example, viral videos spawn parodies which are a form of cultural mimicry. There's also mimicry between culture and organic organisms - for example, Kermit the frog mimics an organic frog.
Mimicry shows that kin selection can still apply between what seem to be non-relatives, provided they share an inherited trait. Cooperation can result because the traits themselves are kin - in the sense that one of them is copied from the other one.